Australia coach Michael Cheika has added props Toby Smith and Tom Robertson to his squad ahead of next weekend's Rugby Championship clash with Argentina.
Rebels forward Smith, 27, and Waratahs star Robertson, 22, have been called up after Allan Alaalatoa suffered a knee injury during the Wallabies' 23-17 win over South Africa in Brisbane on Saturday, which broke a six-Test losing run and eased mounting pressure on Cheika.
Alaalatoa, 22, wore a brace on his left knee as he returned home on Sunday and did not travel with the squad to Perth for Saturday's Test against the Pumas.
Wallabies defence coach Nathan Grey said Brumbies prop Alaalatoa's injury was disappointing, given his progress this year.
"It's unfortunate but it's good to have those guys ready to roll," Grey said.
"He's been among a number of the new guys who have come into the Wallaby setup and really performed well.
"That's what we want from all the guys coming in is to deliver their strengths and I think our scrum was very consistent last night and quite dominant.
"Having those new blokes at the forefront of that is critical."
Cheika was a relieved man after Australia clawed back from 14-3 down early in the Test before overhauling the Springboks for their first win in this year's Rugby Championship after two heavy defeats to New Zealand.
"We've been getting a fair bit of heat and everyone stayed really solid. No one's looked sideways," said Cheika.
"We've got stuck in, enjoyed our training, trained hard and we'll continue to do that no matter what."