Mark Schwarzer concedes he may not earn a Socceroos call-up for next month's friendly against World Cup hosts Brazil if he can't secure some game time with new club Chelsea in the interim.
The veteran goalkeeper, who joined the Premier League glamour club last month accepting he began behind longtime No.1 gloveman Petr Cech, will have just four opportunities to get a run before the September 7 match in Brasilia.
Chelsea have three Premier League fixtures scheduled - starting on Sunday against Hull City - and a UEFA Super Cup match versus Bayern Munich.
"By signing for Chelsea, if I haven't played enough games or played (any) games by next month, we'll have to wait and see what happens," Schwarzer told AAP on Thursday.
"Nobody's guaranteed a spot in the (Australian) squad. The places are very fiercely contested for. Fingers crossed that things work out."
The 40-year-old said he would always make himself available for the Socceroos and had put his trust in national coach Holger Osieck, who supported his decision to move to Stamford Bridge.
"I want to play as many games as I possibly can - be it, firstly, with my club and secondly, for my country," he said.
"I've always had my hand up to play as many games as possible, wherever they've been. It hasn't been an issue to me."
Schwarzer said he had been reassured by returning Chelsea manager Jose Mourinho he would get enough games under his belt before the Socceroos' World Cup campaign next year, despite facing a "massive fight" with Cech for match time.
"I had a long discussion with the manager before I signed for Chelsea and I expressed my concerns about coming," he explained.
"(I had concerns) about limited game time and being right, being ready, being prepared to represent my country at a World Cup next year hopefully.
"He assured me by saying that there's a lot of games on and he believed that I'd play enough games to be ready to play at a World Cup.
"I've got to believe in what he's told me and believe that the opportunities will come."
Australia first choice shot-stopper was unsure what kind of side Osieck would field for the Brazil clash, but expected the core of the team to be the same as it was for their most recent qualifiers.
"But there might be some surprises along the way, who knows," he said.