Australia winger Adam Ashley-Cooper and No8 Wycliff Palu will miss the Wallabies' Rugby Championship clash against Argentina on the Gold Coast on Saturday due to injuries.
Ashley-Cooper has been ruled out for a week with an ongoing nerve compression injury to his neck, which was exacerbated in the tight win over South Africa in Perth at the weekend.
Palu suffered a head knock at the weekend and will follow concussion protocols ahead of his return to play.
"It's disappointing to lose two experienced members of our squad ahead of what is an extremely important game against Argentina," Wallabies coach Ewen McKenzie said.
"As is always the case with sport, the next guy in line now gets a chance to step up and take advantage of the opportunity he'll be given," he said.
Queensland Reds No8 Jake Schatz comes into the Wallabies camp as an additional training squad member, joining scrumhalf Will Genia, hooker Saia Faingaa and prop Benn Robinson.
Australia are third in the four-nation championship standings after three rounds, four points ahead of Argentina, who remain winless.
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