England number-eight Billy Vunipola will likely miss the Six Nations after suffering a knee injury.
The loose-forward injured his knee in England’s win over Argentina on Saturday and underwent an operation on Sunday.
He will be out of action for at least three months which is a massive blow to England.
England coach Eddie Jones praised Vunipola’s form over the last year and wished him a speedy recovery.
“Billy’s been absolutely fantastic for England over the last 11 months and we wish him a quick recovery,” Jones told BBC.
“He’s a very influential player in the set-up and there’s no doubt he’ll be missed for the game against Australia.
“But where there is an injury there’s an opportunity for someone else.
“We’ve had five or six front line players missing throughout the series, so I’ve no doubt we’ll adapt and work that little bit harder this week. I’m sure the players will respond to this by going up a level and peak for this game.”