suggested in December 2014 that it would be unlikely that the club would be permitted to continue playing in north Sydney. Supporters and rivalries The active supporters' group for the Mariners is called the Yellow Army, who sit in bay 16 of Central Coast Stadium during home games. In addition to the Yellow Army, there is a Central Coast Mariners Official Supporters Club, which was established during 2013. The Central Coast region has about 300,000 residents, which gives the Mariners the A-League's smallest local fan base. Accordingly, the Mariners acquired a small-market image among commentators. The Mariners developed a strong rivalry with Newcastle Jets throughout their first season, often referred to as the F3 Derby. The naming is a title previously used for the Sydney–Newcastle Freeway, the major motorway which joins the two clubs' cities. The rivalry's origins date back to before the teams played against each other in the A-League. A May 2005 Oceania Club Championship qualification match, which went to a penalty shootout that the Mariners won, helped create hostility between the sides. In the game, a tackle by Central Coast's Mrdja broke one of Newcastle player Andrew Durante's legs, causing him to miss the following A-League season; Mrdja offered no apology for the tackle, upsetting Jets players. Fans of the clubs battled verbally before and after one 2011 derby match, leading the Newcastle Herald'''s Josh Leeson to call their actions "immature and laughable." In more recent seasons, the F3 Derby has gained less attention in the press than the derbies in Melbourne and Sydney, but Central Coast player Nicholas Fitzgerald maintains that "the players and fans still take it very seriously." Central Coast also have a rivalry with Sydney FC. Like Newcastle, Sydney FC is close in proximity to Central Coast. In 2006, the Central Coast Express Advocates Richard Noone called the Central Coast–Sydney rivalry "Arguably A-League's fiercest". Affiliated clubs Through an investment in the Mariners by Sheffield United the club has the following international affiliations: Sheffield United São Paulo Ferencváros In addition, the club has a player development partnership with the following international clubs: Everton Southern The club previously has formal relationships with the following organisations in Australia: Northbridge (as North Shore Mariners Academy 2014-2020) Players First-team squad Youth Retired numbers 19 – Matt Simon (forward, 2006–12, 2013–15, 2018–22) Club officials Management Technical staff Managers Records John Hutchinson currently holds the team record for number of