Early history The club was established as Ajax Soccer Club in 1955 by Maltese immigrants. In honour of the Maltese
Floriana club, Ajax SC adopted their familiar green and white playing strips. Papas brought in the likes of former
Brisbane Roar youngster
George Lambadaridis, former
Melbourne Heart midfielder
Kliment Taseski and Japanese left-back
Yohei Iwasaki for the 2016 campaign. Gully qualified for the national stage of the
2016 FFA Cup, drawing
A-League side
Central Coast Mariners in the Round of 32 and became at the time only the second member federation club to beat an A-League club when Liam Boland's 92nd minute long-range goal saw the Cavaliers win the tie 2–1 in front of 900 people at Green Gully Reserve. In the Round of 16, Gully came up against local rivals and NPL Victoria compatriots
Melbourne Knights FC. Despite the hosts taking a 1–0 lead early on at
Knights Stadium, a Nicholas Krousoratis goal wedged between a Liam Boland brace saw the visitors progress to the quarter-finals of the competition in front of 2,472 people. Gully were handed its first interstate opponent in the final eight, when it drew
NPL Capital Football side
Canberra Olympic, losing 1–0 in Canberra. In the league, Gully finished in 5th place, losing 5–2 to Oakleigh in the elimination final. On 23 February 2017, it was announced that Papas would be leaving his position as manager of Green Gully to join
Saudi Professional League club
Ettifaq FC as assistant coach to former Villareal coach
Eelco Schattorie for the remainder of the Saudi Professional League season. He was replaced by Green Gully's U20's Head Coach Brian Vanega. Gully finished in fifth place in the league, losing 4–0 to
Bentleigh Greens in the elimination final. In 2018, Papas retook the senior coaching job, but again departed, joining Schattorie at
NorthEast United FC in the
Indian Super League. Stephen Downes, who won the Victorian Premier League in 2011 and Dockerty Cup in 2013 with Gully, took over as manager of the club. Gully finished the season in 12th place, winning just one of its last 16 games. The 12th-placed finish meant that Gully went into the promotion-relegation playoff, where the took on
Moreland City FC at
AAMI Park. Gully, who were 2–0 down, scored in the 91st and 94th minute to take the game to extra time, where Krousoratis eventually scored a winner for Green Gully, retaining the club's top flight status. In 2019, Harry Ho made his debut for the Senior team. Playing in defensive midfield as he made an instant impact with the team claiming a 3–0 victory against Bentleigh Greens. ==Rivalries==