Australian stars Israel Folau and David Pocock are doubts for the World Cup quarter-final with Scotland on Sunday but will train on Wednesday, coach Michael Cheika said.

Folau is trying to shake off an ankle problem that forced him off in the 33-13 whipping of hosts England and appeared to restrict his freedom of movement in the thrilling 15-6 victory over Wales last weekend.

Pocock, a revelation after being switched to No 8 from flanker, is still battling a calf muscle injury that saw him leave the Wales game early, and at a crucial period when they were down to 13 men.    

There was better news regarding centre Matt Giteau, who is set to return to training after missing Tuesday's session. If he suffers no reaction Giteau is in line for his 100th cap.

"Giteau didn't train yesterday, but is OK to train today," said Cheika.

"The other two we read as we go. We have two sessions today so they will maybe do one of the two."

Cheika will name his team Friday.

Source: AFP