Wallabies scrumhalf Tate McDermott will miss this weekend's Rugby Championship finale against New Zealand in Perth and almost certainly Australia's November meeting with Ireland after suffering a serious hamstring injury.
Rugby Australia said on Tuesday that the injury McDermott suffered early in last week's loss to the All Blacks in Auckland would require surgery and "an extended period of time on the sidelines throughout his recovery".
Jake Gordon is expected to be fit after his own hamstring issue to replace McDermott in Saturday's return match against New Zealand with Ryan Lonergan looking set to win his second cap off the bench.
Nic White, who put off his retirement to help the Wallabies cope with the absence of Gordon earlier in the Rugby Championship, will help the squad prepare for the match.
Australia could win a first Rugby Championship title in a decade with a bonus-point victory over the All Blacks on Saturday, but only if Argentina beat world champions South Africa in London.
The Wallabies face Ireland at the Aviva Stadium on Saturday 15 November, among five Tests for Joe Schmidt's side to finish their season.
