Australia coach Ange Postecoglou let rip over reports questioning his future following his side's 2-0 Asian Cup quarter-final victory over China, slamming the rumours as "garbage".

After two superb Tim Cahill strikes gave the Socceroos a 2-0 win over China in Thursday's clash in Brisbane, Postecoglou fired at volley at suggestions his job could be in danger if the hosts fail to reach the final.

"The only challenge I see is continually having to say the same story and it's frustrating the hell out of me," he fumed. "People can't see what I see in this team. We've been managing really well."

Postecoglou, under contract until the 2018 World Cup, has overseen a period of transition for Australia and backed his new-look Socceroos to prove the doubters wrong.

"I still shake my head sometimes with some of the things that I hear and read," he said.

"I think the fans are understanding that this is an exciting team. Mat Ryan, Trent Sainsbury, Jason Davidson, Mat Leckie, Mass Luongo -- they're all 22, 23 years of age, they're putting in enormous performances."

Clearly riled, he added: "My only concern is that I hope none of them get infiltrated by some of the garbage I read and hear on the outside."

Australia scored eight goals in their opening two games of the tournament before being beaten 1-0 by South Korea in a game they dominated, though Postecoglou faced criticism for starting with Cahill and fellow striker Robbie Kruse on the bench.

That defeat relegated the Aussies to runners-up in Group A behind the Koreans and put them on course for a potential semi-final against Japan, who beat them in the 2011 final to lift the trophy for a record fourth time.

But his side returned with a vengeance against China with a refreshed Cahill a constant menace, scoring with an outrageous bicycle kick before killing off the game with a trademark header.

"For people to be talking about what happens if we get eliminated (against China) -- seriously," continued Postecoglou. "We've started out something 14 months ago and I reckon we've stuck to that plan.

"I'll be held accountable if we ever veer away from the plan but we've stuck to that plan and we're delivering.

"The only challenge I see is making sure the players in that dressing room don't limit their potential by listening to a lot of the crap that comes from the outside."