The shock inclusion of Adelaide United teenager Riley McGree to the extended line-up for this month's crunch Russia 2018 qualifiers is proof Postecoglou is still on the hunt for new talent, at home and abroad.
Postecoglou insists the selection was not a statement to some players he's deemed to be lacking in ambition, rather considering the 18-year-old a good chance of making the final 23 that will play Iraq in Tehran and the UAE in Sydney.
That was driven home by the coach's revelation that 20-year-old Sudan-born Melbourne City defender Ruon Tongyik was also well in the frame but for some administrative issues.
"There's two or three youngsters," Postecoglou said.
"Tongyik from Melbourne City is another one who I think is really impressive.
"His paperwork hasn't been cleared yet in terms of being eligible but he would have been close to the squad as well.
"For guys like that, I want to make sure we don't wait too long to give them that opportunity."
Tongyik has played just under 900 senior A-League minutes while McGree has just over 700.
It's the kind of minimal experience requiring nurturing and experimentation, something Postecoglou only last month ruled off the agenda in a year featuring do-or-die World Cup qualifiers, the Confederations Cup and a high-profile international with Brazil.
"I'm not going to pick someone to make a statement," Postecoglou said.
"I believe the kid (McGree) has already shown some outstanding characteristics and I think he's genuinely an exciting player.
"But I've consistently done that through my tenure, making sure we're always casting the net wide - there's not an Aussie player playing anywhere in the world that we're not watching.
"If we feel someone deserves an opportunity, we'll give him an opportunity - Riley's just a continuation of that."