The Aussies have already qualified for next summers finals.
Schwarzer is included in coach Graham Arnold's 23-man squad but Mark Viduka is missing, by prior arrangement with the coach, because he wants to stay with his pregnant wife.
Yakubu returned to the international scene last month by scoring the first goal in Nigeria's 2-0 win over Niger in the Afriacn Nations Cup qualifier. His team now take on Lesotho in the mext round of games, in Maseru on Saturday 7th October.