Preseason Colchester United announced their retainer list on 10 May 2017.
Left back Matthew Briggs and fellow defender
Lloyd Doyley were both released after the club decided against offering them a new contract, while
under-23 players
Femi Akinwande, Callum Harrison, Brendan Ocran,
Dexter Peter, Rhys Williams and Ben Wyatt were also not offered new deals. Meanwhile,
goalkeeper Dean Brill, defenders
Richard Brindley,
Tom Eastman,
George Elokobi,
Lewis Kinsella and
Kane Vincent-Young,
midfielder Charley Edge, and
forwards Diaz Wright,
Drey Wright and
Chris Porter were all offered new deals. Two
Academy players signed one year development contracts on 25 May.
Central defender Josh Pollard and
forward Eoin McKeown signed their first professional deals ahead of stepping up to the under-23 squad. Last season's top goalscorer Chris Porter opted to leave the club on the expiry of his contract, instead signing a two-year deal at League Two rivals
Crewe Alexandra on 31 May after turning down a new contract offer. Tom Eastman became the first Colchester United out of contract first-team player to sign a new deal on 28 June, agreeing to a two-year extension. The following day, Drey Wright, Lewis Kinsella, and Kane Vincent-Young all agreed to one-year extensions to their existing contracts. With Richard Brindley turning down Colchester's contract offer, the U's announced the signing of former
Gillingham right-back
Ryan Jackson on 30 June, with his contract set to begin on 1 July. George Elokobi also left Colchester after failing to agree on a new contract with the club. Goalkeeper Dean Brill opted not to sign a new contract after failing to break into the first team. On 3 July, the club announced that
Charley Edge, Decarrey Sheriff and
Diaz Wright had all agreed to new one-year contracts. A restructuring of the backroom coaching staff meant
Ademola Bankole left after nine years as the club's goalkeeping coach, while former
Watford goalkeeper
Rene Gilmartin arrived as his replacement and to provide competition to
Sam Walker and
Dillon Barnes.
Paul Smith arrived from
Southend United as Head of Academy Goalkeeper Coaching, while former
Wales midfielder
Chris Llewellyn joined Colchester as
under-18 lead coach. Colchester played their first pre-season
friendly on 8 July 2017. In their annual friendly match against
Maldon & Tiptree, the U's earned a 2–0 victory with a goal from
Doug Loft in the first half, and
Louis Dunne in the second half. On 11 July, Colchester played their second pre-season match against
Needham Market. Goals from
Denny Johnstone,
Tariq Issa and two from
Sammie Szmodics sealed a 4–0 victory for the visitors. Midfielder
Tarryn Allarakhia signed a one-year development contract on 12 July, joining from Maldon & Tiptree. On 14 July,
Academy product
Macauley Bonne left the club to join
National League side
Leyton Orient, signing for an undisclosed fee alongside former U's player George Elokobi. Colchester won their third successive friendly the same day, beating
Llandudno 1–0 in north Wales courtesy of a Denny Johnstone goal.
Cole Kpekawa joined Colchester for a second spell on 17 July, signing a one-year deal from
Barnsley for an undisclosed fee having featured on loan from
Queens Park Rangers during the
2014–15 season. Meanwhile, injury-stricken
Brennan Dickenson revealed that the serious knee injury he sustained in training in April 2017 would keep him out of first-team action until February 2018. On 18 July, Colchester recorded their fourth consecutive pre-season victory with a 2–0 win against a
West Ham United XI at the
Colchester Community Stadium. Drey Wright and Denny Johnstone were the goalscorers. Colchester signed
Wigan Athletic forward
Mikael Mandron on 21 July. He signed for an undisclosed fee on a two-year deal. On 22 July, the U's claimed their fifth pre-season win with a 3–0 victory against
Braintree Town. Sammie Szmodics scored twice and Louis Dunne added a third late on to secure the win. On 24 July, United were hit by the news that club
captain Luke Prosser would be ruled out of action for a further two months after undergoing a further operation on his injured knee. Colchester suffered their first pre-season defeat on 25 July when they slipped to a 1–0 defeat to
Ipswich Town at the Community Stadium. Another defeat followed against
Gillingham on 28 July, falling to a 2–1 defeat. Colchester's goal was scored by Ryan Jackson against his former club. Colchester also confirmed the signing of defender Dan Jefferies from
Swansea City who joined the
under-23 side on 28 July, and midfielder Sam Warde joined the under-23s from
Huddersfield Town on 31 July. On 1 August, Colchester made two further under-23 additions, with the signing of Australian goalkeeper Dominic Kurasik from
Brentford and former-
Crystal Palace left-back Callum Sturgess on one-year contracts. On the eve of the new league season,
Alex Wynter had his contract cancelled by mutual consent and then immediately signed for National League side
Maidstone United.
August Colchester's League Two campaign began at
Accrington Stanley on 5 August. Ryan Jackson and Mikael Mandron made the starting eleven for their debuts, while Cole Kpekawa made his second debut for the club from the substitutes bench. Accrington took a ninth-minute lead through
Kayden Jackson, and went 2–0 up through
Billy Kee's 32nd-minute strike. The U's found themselves 3–0 down after the break when
Omar Beckles scored, but pulled a late goal back from half-time substitute Sammie Szmodics. On 7 August, Colchester signed
Coventry City winger
Kyel Reid on loan until January. Dillon Barnes joined
National League South side
Welling United for one month on 8 August. Colchester hosted
Championship side
Aston Villa in the first round of the
EFL Cup on 9 August. A mistake from goalkeeper Sam Walker allowed
Scott Hogan to slot in an early opening goal for the visitors. Mikael Mandron missed a chance to equalise from the
penalty spot when his effort was saved by
Jed Steer, before an unfortunate
Frankie Kent scored an
own goal to double Villa's lead on 19 minutes. Kent redeemed himself six minutes before the interval to reduce Colchester's deficit at 2–1. However, the score remained the same through the second half as Colchester exited the competition at the first round stage for the seventh consecutive season. On 15 August, Colchester offered new contracts to Brennan Dickenson, Kurtis Guthrie, Frankie Kent, Tom Lapslie and Drey Wright, while winger
Dion Sembie-Ferris was released by mutual consent in search of first-team football. On 18 August, it was announced that goalkeeper Daniel Wilks had joined the under-23 squad on loan from
Maldon & Tiptree until January 2018, while centre-back Josh Pollard, right-back George Keys, and left winger
Ryan Clampin all joined Maldon & Tiptree on youth and work experience loans. Also joining the club was defender Will Wright who joined on a two-year contract from
Hitchin Town. Denny Johnstone made a season-long loan move to
St Johnstone on 24 August, while
Louis Dunne also temporarily left the club on loan, joining National League South side
Concord Rangers for one month. Colchester earned their first win of the season on 26 August in their first-ever meeting with
Forest Green Rovers. Kyel Reid scored his first U's goal after only four minutes of play, before Frankie Kent scored the second goal of the game and his second of the season. Forest Green scored two minutes later to make it 2–1. Sammie Szmodics scored 20-minutes into the second half, before Kane Vincent-Young became the second player of the day to score his first Colchester goal. Three minutes into injury time,
Courtney Senior, making his first-team debut from the bench, scored to finalise a 5–1 win. In the first group stage match of the
EFL Trophy, Colchester hosted
Reading U23 at the Community Stadium. Sammie Szmodics continued his goalscoring form inside five minutes, but Reading equalised through
Josh Barrett before taking the lead through Ben House prior to half-time. Second-half substitute Eoin McKeown, making his first-team debut, equalised in the 87th minute to take the tie to a
penalty shoot-out. The U's won 6–5, earning a bonus point for the win on penalties. Young
Charlton Athletic striker
Brandon Hanlan also joined on loan until January, while free agent
Sanmi Odelusi signed a permanent six-month contract after the forward had been training with the U's over the summer since his release by
Wigan Athletic. Another striker followed suit in signing, with
Portsmouth's
Nicke Kabamba arriving on loan until January, while
Crystal Palace centre-half
Ryan Inniss signed on loan until the end of the season.
September Colchester started September with a defeat at
Cambridge United. Naming an unchanged starting eleven from the side that beat Forest Green 5–1 the previous weekend, the U's fell to a 1–0 defeat on 2 September thanks to a second-half goal from
Uche Ikpeazu. Eli Phipps joined Dillon Barnes on loan at Welling United on 8 September, while Barnes' loan was extended until 8 November. Also heading out on loan was Charley Edge, who signed on a one-month deal at
National League North side
Leamington. Colchester returned to winning ways with an impressive first-half performance against
Crawley Town in a 3–1 win. Sammie Szmodics scored his fourth goal of the season before assisting Ryan Jackson's first goal for the club after 14-minutes. Mikael Mandron completed the home side's scoring after 38-minutes. In the second-half, Sam Walker saved a
Mark Randall penalty, but Crawley did pull a goal back from
Jimmy Smith on 66-minutes. They were then held to a 1–1 draw against
Chesterfield on 12 September.
Louis Reed scored for the visitors shortly before half-time but debutant Brandon Hanlan scored from the substitutes bench after 82-minutes. Colchester's terrible away form continued on 16 September with a 3–1 defeat at
Cheltenham Town. Within 15-minutes, the U's found themselves 2–0 down with both goals coming from Cheltenham's
Kevin Dawson. Colchester were awarded a penalty in the 26th minute after
Taylor Moore handled in the penalty area and Sammie Szmodics converted to score his fifth goal of the campaign. In the second-half, Mikael Mandron was sent off for a handball offence in the penalty area, but
Brian Graham's penalty was saved by Sam Walker. Shortly afterwards,
Jamie Grimes scored to complete the victory for Cheltenham and condemn Colchester to their fourth successive away defeat. On 16 September, winger George Brown made his debut for
East Thurrock United in an
FA Cup win against
Biggleswade Town after joining the club on loan earlier. Meanwhile, young goalkeeper Dominic Kurasik also left the club on loan to join Maldon & Tiptree, signing on 19 September. On 21 September, Frankie Kent signed a new contract with the club to remain until summer 2020. Colchester's next game was against old rivals
Wycombe Wanderers at the Community Stadium. Despite having the better of the possession, the U's went down 1–0 after 32-minutes from a
Nathan Tyson goal, but Brandon Hanlan equalised shortly before half-time to score his second goal in only his third Colchester appearance.
Craig Mackail-Smith scored Wycombe's winner in the 67th minute as the visitors held on for a 2–1 victory. The U's travelled to
Grimsby Town on 26 September for a midweek league fixture. A frantic start saw Kyel Reid score the opener, before
JJ Hooper equalised two minutes later. In the second-half, Reid scored his second of the game, but an 89th-minute penalty from
Sam Jones shared the spoils. On 30 September, Colchester recorded a 1–0 away win at
Yeovil Town, their first away victory of the season.
Sean Murray's first goal for the club proved to be the difference between the sides as the U's moved up to 16th in the League Two table.
October October began with a narrow 1–0 defeat in the EFL Trophy at home to
Gillingham on 3 October. An injury-time winner from
Max Ehmer was enough to separate the two sides. Colchester earned their first successive league win of the season on 7 October by beating
Mansfield Town 2–0 at the Community Stadium. Sean Murray followed up his debut goal for the club with another the following weekend after 29-minutes, before Mikael Mandron doubled the U's lead five minutes later. The U's hosted
Carlisle United on 14 October, losing 1–0 in a close affair in which Colchester mostly dominated. On 16 October,
Diaz Wright joined
Needham Market on loan until the end of November, while Colchester were drawn at home to
Oxford City in the first round of the
FA Cup which would be the first-ever meeting between the two clubs. They returned to winning ways three days later with an away victory at
Newport County ending the home sides' ten game unbeaten home record which stretched back to March. Following a goalless first-half, former County defender Ryan Jackson scored his second goal of the season after 72-minutes, before Mikael Mandron added a second five minutes later.
Shawn McCoulsky pulled a goal back for Newport on 86-minutes but the U's held on to record a 2–1 win. A 0–0 draw at
Coventry City followed, a match in which Tom Lapslie was sent off following two bookings in less than a minute after a yellow card for a foul and then a red card for a deliberate handball. Colchester closed out October to come from behind and win at home to
Crewe Alexandra on 28 October.
Jordan Bowery gave Crewe a 22nd-minute lead, but this was cancelled out by Mikael Mandron's fifth goal of the season six minutes before half-time. The U's took the lead on the hour mark when Tom Eastman headed in his first goal of the campaign, before Mandron scored his second of the game on 71-minutes to round off a 3–1 victory. As a result of collecting ten points in five league games through October, John McGreal was nominated for the October
EFL League Two Manager of the Month award. Meanwhile, Mikael Mandron, who scored four goals in five league games during October was nominated for the
EFL League Two Player of the Month award.
November Colchester were knocked out of the FA Cup in the first round by Oxford City on 4 November. The U's fell to a 1–0 defeat at the Community Stadium. This was followed up by an EFL Trophy
Essex derby defeat to
Southend United, who won 2–0 to knock Colchester out of the competition at the group stage for the second successive season. Returning to league competition on 11 November, Sammie Szmodics scored his sixth goal of the season from the bench to earn Colchester a 1–0 win at
Barnet. They were then held to a 0–0 draw at home against
Morecambe on 18 November to extend their unbeaten run to five league games. Their good run continued on 21 November when Sammie Szmodics again proved the difference with an early goal in Colchester's 1–0 home win against
Lincoln City. During their away game at
Notts County on 25 November, following a goalless first-half, County took the lead when
Shola Ameobi scored from the penalty spot after Mikael Mandron fouled
Ryan Yates in the area. Mandron later missed a penalty kick of his own after Ryan Jackson was fouled by
Jorge Grant. However, Colchester looked to have secured a point when substitute Sanmi Odelusi scored his first goal for the club and levelled the match in the 89th minute. Ryan Yates then scored in the third minute of injury time to hand the home team a 2–1 victory.
December Following a two-week break due to their early FA Cup exit, Colchester returned to action in a home match against
Exeter City on 9 December. The U's were gifted the lead when
Troy Archibald-Henville scored an own goal after 23-minutes. Then, three minutes later, Sammie Szmodics scored from the penalty spot after Kane Vincent-Young was brought down in the box by
Jake Taylor. Colchester then scored a third goal in seven minutes as Szmodics netted his ninth of the season. Exeter pulled a goal back in the second half through
Jayden Stockley as Colchester held on to a 3–1 victory. Forward Nicke Kabamba made an early return to parent club Portsmouth on 14 December after failing to score in ten appearances for the U's. On 15 December, Colchester won a five-goal thriller at
Swindon Town to promote themselves into the play-off positions. They fell behind on 36-minutes from a
Kaiyne Woolery goal before Frankie Kent scored an equaliser from a corner kick in first half injury time. Mikael Mandron then put the U's ahead on 63-minutes, but then Swindon equalised through
Kellan Gordon. Two minutes later, Colchester had the lead again as Sammie Szmodics beat a man to record his tenth goal of the campaign. On 21 December, forward Sanmi Odelusi was told that his contract would not be renewed when it expired on 31 December. Sammie Szmodics scored his tenth league goal of the season in Colchester's 1–1 home draw with
Port Vale on 23 December. He opened the scoring after 32-minutes, but Vale equalised in the second half through
Marcus Harness. They then secured a 2–0 win at Crawley Town on Boxing Day. A goal in either half from Mikael Mandron and Sammie Szmodics secured victory which moved the U's up to fifth position in the league table. In the final game of 2017, Chesterfield held the U's to a 0–0 draw at the
Proact Stadium. Following an unbeaten December including three wins and two draws, Sammie Szmodics was nominated for League Two Player of the Month, becoming the second Colchester player of the season to receive the nomination, while John McGreal was nominated for the League Two Manager of the Month award for a second time this campaign. On 12 January, it was revealed Szmodics was named as Player of the Month for League Two.
January Colchester recorded their second consecutive goalless draw at home to Cambridge United on New Year's Day to remain 8th in League Two. On 3 January, Craig Slater moved to
Scottish Championship side
Dundee United on loan until the end of the season. The U's bolstered their forward line with two signings from Maldon & Tiptree. Incoming were
Junior Ogedi-Uzokwe, who had scored 34 goals in 34 games this season and was the top scorer in the
Isthmian League, and also left-sided player
Ryan Gondoh. The following day, Lewis Kinsella and
Tommy O'Sullivan both left the club in loan deals. Kinsella joined National League side
Aldershot Town initially until early February, while O'Sullivan signed for fellow National League side
Torquay United until the end of the campaign. Colchester suffered their joint-worst defeat of the season so far on 6 January as they crashed to a 4–1 home defeat by Cheltenham Town. Kurtis Guthrie started his first league game of the season and scored on 40 minutes to hand the U's a 1–0 advantage going in to the interval. However, Kyel Reid was sent off for violent conduct just a minute before half-time. Cheltenham got back into the game through Sanmi Odelusi registering a debut goal and his first since his switch from Colchester. The floodgates then opened as
Nigel Atangana,
Jerell Sellars and
Mohamed Eisa each scored to give the away side all three points. On 8 January, young centre forward Eoin McKeown rejoined Maldon & Tiptree on loan until the end of the season. The U's recorded their second successive defeat for the first time since September as they fell to a 3–1 defeat at Wycombe on 13 January.
Adebayo Akinfenwa scored the host's opener after 14-minutes and then their lead was doubled by
Paris Cowan-Hall on 24-minutes. With 15-minutes remaining, Wycombe scored a third through
Luke O'Nien, before Sammie Szmodics pulled a goal back for Colchester four minutes later. The game did however see the first appearance of the season for club captain Luke Prosser. On 17 January, Brandon Comley joined Colchester permanently, signing for an undisclosed fee. He joined on a -year contract. Colchester were held to a 1–1 draw at home against Grimsby on 20 January. The visitors took the lead through
Charles Vernam on 38-minutes, but Sean Murray's equaliser shortly after the break earned a point for the U's. The U's made a defensive signing on 24 January by bringing in
Millwall youngster
Paul Rooney on a -year contract for an undisclosed fee. Leaving the club on loan for a second spell in the National League South was goalkeeper Dillon Barnes, who joined
Hemel Hempstead Town for an initial month-long loan on 26 January. On 27 January, Colchester conceded a late goal to draw at Port Vale. Courtney Senior scored on his first start for the club to give the U's the lead after 12-minutes, only for
David Worrall to equalise on 33-minutes. Four minutes in to first-half injury time, Drey Wright scored his first goal of the season to again hand the lead to Colchester. However, Worrall scored again in the 87th minute to rescue a point for the home side and leave the U's without a win in six games. Transfer deadline day fell on 31 January and the club's first business of the day was the signing of Queens Park Rangers winger
Olamide Shodipo on loan until the end of the season. They also signed
Doncaster Rovers forward
Liam Mandeville on loan until the end of the season, while Lewis Kinsella, who was on loan at Aldershot Town, had his contract cancelled by mutual consent. He then signed a permanent deal with Aldershot. Also on the way out was under-23s defender Dan Jefferies who joined Scottish Premiership side
Dundee.
Aaron Barnes arrived on a permanent basis from Charlton Athletic, while
Ben Stevenson signed on loan from
Wolverhampton Wanderers after joining the Championship side from Coventry City earlier in the day.
February After signing for Colchester on 31 January, Aaron Barnes rejoined Torquay United on loan until the end of the season on 1 February, having previously been on loan there from Charlton earlier in January. On 2 February, Cameron James headed out on loan for the remainder of the season to
National League South side and his hometown club
Chelmsford City. On 3 February, Colchester recorded their first win of 2018. Following a goalless first-half with Newport County, substitute and debutant Ben Stevenson scored ten minutes after arriving on the pitch, before Tom Eastman doubled the U's lead after a goal mouth scramble. The two sides swapped places in the League Two table on the back of the result. They followed this up with a 1–1 draw at Carlisle, Courtney Senior scoring the goal for the U's on 10 February. The U's then won 2–1 at home against Coventry City. Junior Ogedi-Uzokwe scored on his first start for the club from the penalty spot on 27-minutes, but on 56-minutes,
Tom Bayliss scored an equaliser for the visitors. Two minutes from time, Mikael Mandron converted an Ogedi-Uzokwe cross to seal the win for the U's. Colchester's patchy form then continued with a 1–0 defeat at Crewe on 17 February, and then a further 1–0 defeat against Barnet at home on 24 February.
March Diaz Wright signed for
Braintree Town on loan on 9 March. Automatic promotion hopefuls Mansfield Town hosted the U's on 10 March. They took the lead through
Kane Hemmings after 22-minutes, but after the break Colchester levelled through Brandon Comley, his first-ever professional goal. The U's held on to earn a point but slipped into the bottom-half of the table. On 16 March, Charley Edge joined Needham Market on loan until the end of the season. Colchester missed an opportunity to take an early lead against Yeovil on 17 March after Sammie Szmodics had an eighth-minute penalty kick saved by
Stuart Nelson. The visitors then took the lead in the 21st minute from an
Alex Fisher goal. Yeovil held on to record a 1–0 victory and leave Colchester nine points adrift of the play-off positions. They were then held to a 0–0 draw at Morecambe on 20 March. The U's earned their first win in five and their first away victory in 2018 on 24 March as they defeated Stevenage 1–0 at
Broadhall Way. Mikael Mandron's first-half goal proved to be the difference between the sides. On 29 March, Kurtis Guthrie had his contract with the club cancelled by mutual consent, with his final appearance arriving in the 1–0 defeat by Yeovil on 17 March when he had an on-field confrontation with Sammie Szmodics over taking Colchester's penalty kick. Colchester earned their first back-to-back victories since December with a 2–1 win over promotion-chasing Luton Town at the Community Stadium in their Good Friday fixture. The tie was marred by the serious injury to Hatters' midfielder
Luke Berry in only the second minute of the game when his leg was accidentally caught by U's midfielder Tom Lapslie in a challenge. Both sets of players were taken off the pitch while Berry received eleven minutes of treatment on the field before being taken to hospital. When play resumed, Tom Eastman scored the opening goal after 15-minutes of play, before Luke Prosser doubled the advantage for the home side with his first goal for the club. Late in the second-half, Ryan Jackson fouled
Luke Gambin in the penalty area which was converted by
Danny Hylton but Colchester held on for victory.
April For the first time this season, and the first time since December 2016, Colchester earned a third consecutive league victory in their first-ever visit to
The New Lawn stadium when they faced Forest Green Rovers. Drey Wright scored within 19-seconds to give the visitors an early advantage, but the U's were pegged back when Tom Eastman fouled
Haydn Hollis in the box and
Reuben Reid converted. Early in the second-half, Colchester's lead was restored when Ben Stevenson scored 90-seconds after the interval. Again, Colchester held on to their single goal advantage to take victory. However, Colchester's run was halted by league-leaders Accrington Stanley on 7 April who claimed a 1–0 win at the Community Stadium. On 13 April, after failing to make an appearance since January, Cole Kpekawa left the club by mutual consent. Colchester fell to their second successive home defeat on 14 April when Notts County earned a 3–1 win at the Community Stadium. Drey Wright had opened the scoring within the first ten minutes of play, but a revival in the second half by County through
Jonathan Forte,
Shola Ameobi and
Richard Duffy saw the away side claim victory. On 18 April, having broken into the first-team, Courtney Senior signed a new two-year contract with the club. He then stepped off the bench in his next game against Lincoln City to score the equaliser for Colchester after they had fallen behind five minutes earlier to an
Elliott Whitehouse penalty. In the 83rd minute of the game, with the scores at 1–1,
Michael Bostwick was sent off for the home side, but the U's couldn't capitalise on their man advantage, and went on to lose 2–1 when substitute
Luke Waterfall headed in the winner in the fourth minute of added time. The result ended Colchester's faint play-off hopes as they ended the day ten points behind seventh-placed Coventry with just two games remaining. Goalkeeper Dillon Barnes was handed his first league start for Colchester on 28 April in their final home game of the season against Swindon Town, and he kept a clean sheet as the match finished 0–0. Ryan Gondoh was also introduced as a second-half substitute to make his debut for the club. The U's completed their season with a whimper on 5 May as they were beaten 1–0 at Exeter City on 5 May, meaning they finished 13th in the league table, their worst league performance for 24 years. ==Players==