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Australia are sweating on the fitness of influential centre Matt Giteau, as their problems mount ahead of the Pool A decider with Wales at Twickenham on Saturday.

The Toulon veteran, whose try in the final moments put the seal on the Wallabies win against England last weekend, is struggling with sore ribs after being hit by Owen Farrell off the ball.

The Sydney Morning Herald report that the Aussies are confident Giteau will be OK to face Wales, but with doubts also against Israel Folau (ankle) and Rob Horne (shoulder) as well as the suspension meted out to Michael Hooper, it has been a disruptive week for coach Michael Cheika.

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(Image: Getty Images)

Giteau has been one of the Aussies’ star performers since resuming his international career in the week of ARU changes to the eligibility rules on overseas-based players.

However wing Adam Ashley-Cooper believes his squad has the depth to cope with what comes their way.

“It is something we really haven’t had in a long time. We are going to be tested this weekend,” Ashley-Cooper said.

“There are question marks around Izzy (Folau) and his ankle, Rob Horne and his shoulder, Gits didn’t train this morning because of his ribs, I am sure he’ll be right.

“But we are now calling on those guys who have been waiting patiently. They certainly have the talent to start Test match football and we will be relying on them to start this weekend.”

Both Wales and Australia will name their sides on Thursday.