Franjic, whose ties with Postecoglou go back their halcyon Brisbane Roar days, is racing against time to overcome a hip-related problem.

Scans have cleared the rebounding right-back of serious injury and Postecoglou hopes Franjic will be deemed fit for Saturday night's title decider against South Korea in Sydney.

"In fairness to Ivan, we will give him every chance," Postecoglou said on Thursday.

"If he's not, then we'll deal with it then.

"There's big ramifications. This is a big game. It will be the biggest game of his life."

Postecoglou admitted it would be heartbreaking to miss the final for Franjic, whose World Cup in Brazil last year was ended by a hamstring tear in the opening game.

Franjic's absence would also leave a massive hole to fill for Postecoglou.

The 27-year-old has been influential, playing every minute of every Cup game - he's logged two goal assists and created 10 scoring chances in the tournament despite his defensive station.

And the only other specialist right-back in the Socceroos squad, Aston Villa's Chris Herd, has returned to England for treatment on his tournament-ending Achilles injury.

Franjic was hurt in the final minutes of Australia's 2-0 semi-final triumph against United Arab Emirates in Newcastle on Tuesday night.

"He is still a bit sore from the game but he looks more promising today than he probably did post-game," Postecoglou said.

"He's definitely still a chance.

"He had some scans but nothing really came up. It's nothing serious.

"If it was a normal break then he would be fine but obviously the quick turnaround is the issue.

"But again, that is balanced by the fact it's a big game and I'm sure he will give himself every chance."

Postecoglou said he had not even bothered pondering his options should Franjic be ruled out.

"I don't think there's a footballer left in this tournament that is 100 per cent," he said.

"Once they cross that white line you assume that everyone is going to give everything they have got," he said. AAP