Australia meets the hosts on Saturday in the quarter-finals of the Asian Cup.

With the loss of Tom Rogic through suspension, coach Graham Arnold may tinker with his tactics.

At times the Socceroos have struggled to break down defensive teams with their 4-3-3 line-up, and they could move to a 4-4-2 for the knockout match.

Giannou, who has come off the bench in the past three games and bagged a goal against Palestine, has backed playing with two centre forwards.

"I prefer to be the second striker in a game rather than the one who sits up there and waits but either way I'm happy ... if I'm playing, I'm happy," he told Fairfax Media.

"It helps (with) attacking, as well. The more numbers you have up front, it's not that easy for the others to predict what you're going to do."

Giannou was a late-call up to the Asian Cup squad after an injury to Martin Boyle.

"I think it's the definition of football," the 28-year-old said.

"You never know what's going to happen. You could be nowhere and some little thing can happen that can take you to the top. If I come on I'm going to try and do what I need to do. If I start, I'm confident enough that I'll be the man. I have to be."