Australia face another injury concern with Matt Giteau struggling to recover from a rib injury he picked up against England.
While the Wallabies are confident their veteran inside centre will be fit, he was unable to take part in training as a result of the pain.
Giteau scored the final try in Saturday's 33-13 win over England, but had been shaken up ten minutes earlier by a shoulder charge from Owen Farrell, who was yellow-carded for the incident.
Australia are already sweating over the fitness of Rob Horne, who went off in the opening minutes at Twickenham, and Israel Folau, while Michael Hooper is suspended for the game.
"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," winger Adam Ashley-Cooper told the Sydney Morning Herald.
"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."
If Giteau doesn't make it, his place will likely be taken by Matt Toomua, who was on the bench against England, while Kurtley Beale and Drew Mitchell would likely come in for Folau and Horne.