Newcastle United Dummett started his career in the
Newcastle United youth system, captaining the club's reserve team on several occasions.
Loan to Gateshead Dummett joined
Conference National side
Gateshead in March 2012, initially for a month-long loan, which was then extended until the end of the season, helping the team keep six clean sheets from ten matches.
Loans to St Mirren The following season he was loaned to
Scottish Premier League club
St Mirren. After returning from his loan spell at St Mirren, Dummett made his debut senior appearance for Newcastle in an
FA Cup tie away defeat to
Brighton & Hove Albion on 5 January 2013. After the match, Dummett spoke out on his debut, that his Newcastle United debut was a dream come true. He then rejoined St Mirren on 31 January 2013 on loan for the rest of the season. Dummett played the full game for St Mirren in their
Scottish League Cup final 3–2 win over Hearts, the club's first major cup for 26 years. Dummett also set up the second St Mirren goal in the 46th minute, for
Steven Thompson, which put the Saints 2–1 up.
Return to Newcastle United in 2016 Dummett returned to Newcastle, and signed a one-year contract extension. He made his debut for the club as a substitute during a 4–0 defeat to
Manchester City on the opening fixture of the 2013–14 season, coming on after a sending off of fellow defender
Steven Taylor and playing the full second half of the game. He scored his first goal for Newcastle in a 2–2 draw at home to
Liverpool in October 2013. Just weeks after scoring his goal for the club, Dummett put pen-to-paper on a new contract at Newcastle, signing a deal that could extend until 2019. On the final day of the season, Dummett made a challenge on Liverpool forward
Luis Suárez. Due to knee surgery which jeopardised Suárez's chances of playing at the
2014 FIFA World Cup, fans in his native Uruguay sent online death threats to Dummett. Dummett started the
2014–15 season as Newcastle's first-choice left back, with
Davide Santon injured and
Massadio Haïdara on the bench. Dummett grabbed his second Magpies goal on 25 September 2014, scoring a late winner in extra-time against
Crystal Palace in the
League Cup. Playing alongside captain
Fabricio Coloccini in the centre of defence, Dummett helped Newcastle keep clean sheets in victories over
Manchester City and
West Bromwich Albion. On 12 January 2016, Dummett scored a 90th-minute equaliser against
Manchester United in a match that ended in a 3–3 draw at
St James' Park. Since 2017, Dummett has often been deployed as a
centre back, as well as
left back. On 8 May 2021, He scored his first goal in five years in a 4–2 away win against
Leicester City. On 5 May 2022, Dummett signed a new one-year contract extension with the club and on 9 July 2023, the club announced he had agreed another one-year extension. On 29 May 2024, Newcastle announced that Dummett would be leaving the club after the expiry of his contract, due to run out on July the same year.
Wigan Athletic On 8 November 2024, it was announced that Dummett had joined League One side
Wigan Athletic on a short-term contract.
Carlisle United On 10 January 2025, following the expiry of his contract with Wigan, Dummett joined
League Two bottom side
Carlisle United on a short-term deal until the end of the season. He made his debut for the club against
Fleetwood Town in a 2–1 victory, but was substituted within 5 minutes due to injury.
Retirement On 4 December 2025, Dummett announced his retirement from professional football. ==International career==