Tim Cahill has left A-League side Melbourne City with a view to getting more first-team football ahead of the 2018 World Cup.
The former Everton midfielder, who turned 38 today, admitted he would need regular game time after helping Australia qualify for next summer's tournament in Russia.
Cahill could become the fourth player to score at four World Cup finals, after goals at Germany 2006, South Africa 2010 and Brazil 2014.
"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 told Sky Sports.
"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."
Melbourne head coach Warren Joyce added: "Having players of Tim's stature in the dressing room can only help develop a squad's ambitions, and his impact on the team and for the club is well known, particularly with the younger players in the squad.
"In the period that I've worked with Tim, I have appreciated the contribution he has made both on and off the field and the dedication he has shown in training. We all wish him the very best on the next stage of his career."