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Australia superstar Israel Folau has emerged as a major injury doubt for Saturday’s World Cup Pool A showdown against Wales at Twickenham.

The Wallabies full-back was forced off the field during the 33-13 victory over England with an ankle problem and did not train yesterday and might not train today.

Backs coach Stephen Larkham also revealed wing Rob Horne is likely to miss the game with a shoulder problem while flanker Michael Hooper faces a disciplinary hearing later this morning after being cited for taking out England full-back Mike Brown illegally at a ruck.

“We have an injury concern over Israel,” said Larkham.

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“He came off the field in the game against England with a sore ankle and did not train yesterday (Monday).

“We will see how he pulls up today and I am not sure if he will even train.

“Rob is still on the injured list but we are hopeful he can be turned around in a week or so.

“It is unlikely he will face Wales.

On Hooper’s hearing, Larkham added: “Michael is optimistic. We are aware there is a process to undertake and confident in that process.

“They are nervous times for everyone.

“I was a little bit surprised the case was taken up I guess, but it’s an independent citing commissioner and it's based on his findings."

Wales and Australia have already qualified for the quarter-final with the winner of this weekend’s showdown set to face Scotland or Japan in the knockout stages and the loser probably tackling South Africa.