The Waratahs have ruled Wycliff Palu out of this week's Super Rugby match against the Western Force in Perth on Saturday.
Palu sustained an ankle injury in the match against the Sharks two weeks ago but has failed to recover.
The Wallaby enforcer missed last week's match against the Stormers in Cape Town due to the injury.
Coach Michael Cheika has ruled him out for this week's match against the Force and has sent him home to Sydney.
Cheika said that he hopes to have Palu back for their match at Sydney Football Stadium against the Bulls on Easter Saturday.