The coach told media that even though China had done well so far there was nothing they could do to surprise The Socceroos in Thursday's Asian Cup quarter-final in Brisbane.
"We will be well prepared," Postecoglou told media.
"I don't think there will be surprises for us out there. We know what to expect.
"They're a very good side and have shown that through the group stages, they have obviously won all three games and are feeling confident.
"They are very disciplined, well organised, and as always can be a threat going forward," he added.
Postecoglou has depth in his squad after spending a year testing his options and now has the nice problem of who to bring in, rather than who should be left out.
"We will put out a team, like I have for every game, that we think can win us the game tomorrow night, nothing changes from that," he said.
"From a coaching perspective, the pleasing thing for me is that they're all ready to go and putting their hand up and wanting to be a part of it, which is great."
Postecoglou could make as many as five changes from his starting line-up after the loss against South Korea.
Australia have plenty of options with captain Mile Jedinak returning from injury and attackers Tim Cahill, Robbie Kruse and Mathew Leckie, tipped to start after coming on from the bench against the Korean Republic in their last game.