Postecoglou, who replaced sacked coach Holger Osieck eight months out from the World Cup, has retained embattled defender Lucas Neill, but the under-pressure 35-year-old faces a battle to keep the captain's armband he has worn since 2006.
Postecoglou said he had initially named Schwarzer in his 22-man squad for the November 19 clash against Costa Rica in Sydney, but the 41-year-old had informed him he no longer wanted to play on.
Borussia Dortmund's Mitch Langerak and Belgium-based Mat Ryan were the two keepers named in Postecoglou's squad, which retains the core of the ageing roster that sealed qualification for a third consecutive World Cup.
(Reporting by Ian Ransom; Editing by Peter Rutherford)
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