David Pocock will miss the rest of the Rugby Championship after breaking his hand in Australia's 36-20 win over Argentina in Perth on Saturday.
The back-row forward requires surgery on the injury and he could also be a doubt for the Wallabies' tour of Europe, with the squad set to depart on October 22.
Pocock was substituted in the 36th minute against the Pumas, Australia coach Michael Cheika revealing the 28-year-old tried to continue despite the injury.
"It was quite swollen so it was hard for him to move his hands," said Cheika.
"He wanted to play through, I had to take him off."
Pocock announced on social media he will undergo surgery on his hand when the swelling around the injury has reduced.
"Really disappointed to be ruled out of #RugbyChampionship," Pocock wrote on Twitter.
"Surgery on my hand once the swelling goes down. Thanks for all the support."
Really disappointed to be ruled out of #RugbyChampionship. Surgery on my hand once the swelling goes down. Thanks for all the support.-- David Pocock (@pocockdavid) September 18, 2016
New Zealand have already wrapped up the Rugby Championship title, partly due to their pair of victories over Australia.