Cahill has only started one match for the third-placed A-League club this season, speaking of his desire for more game-time after the Socceroos qualified for the 2018 FIFA World Cup with a 3-1 play-off second leg win over Honduras.
In a joint statement released by Cahill and Melbourne City on Wednesday morning, the 38 year-old praised the club, its fans and the A-League, before reiterating his desire to represent Australia in Russia, as he looks to shore that up with a new deal.
Cahill enjoyed stints at Millwall, Everton, New York Red Bulls and Shanghai Shenhua, before signing on as City's marquee player last season.
“Playing in the domestic league in Australia was always an important career goal for me, and my experience here has been fulfilling from start to finish," Cahill said. "The welcome from fans, the quality of the facilities and the ever-increasing quality of football continues to be a source of immense pride.
“I want to thank Melbourne City, the players and the staff, and especially the fans. It was amazing to help bring the first piece of silverware to this Club, and this makes me very proud. My experience here has been great and I have enjoyed contributing to the culture inside the Club, being asked to take on a leadership role and, most importantly, being able to mentor a lot of the younger players - something I will continue to do in the future.
"I wish the Club, Head Coach, players and all the fans all the very best for the rest of the season. It’s never easy to say goodbye but it was great to win last weekend and make a contribution, and also to have the Club sitting third in the league.
“Qualifying for the World Cup has been a great adventure, and it would be a massive honour to represent my country in Russia. That will be my focus in the coming months.”