Brumbies hooker Billy Pollard has been added to the Wallabies squad ahead of the first Test in Mendoza.
Pollard will fly to Argentina as injury cover after David Porecki was ruled out following a head knock in training.
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Wallabies officials confirmed Porecki will be re-assessed before the second Test in San Juan.
The 29-year-old has established himself as a reliable starter following his debut, one of three forwards (Michael Hooper, Rob Valetini) to start in all three games against England.
Porecki missed the end of the Super Rugby Pacific with a neck complaint, with the concussion adding to the growing injury crisis within the camp.
It was confirmed at the start of the week superstar centre Samu Kerevi (knee) will miss the rest of the season, joined on the sidelines long-term by Tom Banks (arm), Izack Rodda (foot), Izaia Perese (patella) and Cadeyrn Neville (knee).
Andrew Kellaway (hamstring) remains in Australia as he pushes to return for the South Africa stint of the Rugby Championship, joined by Angus Bell (toe) and Scott Sio (shoulder).
Pollard has been one of the breakout stars for the Brumbies in 2022, having made his debut in the final round of Super Rugby Pacific.
He established himself a regular spot in the side despite the presence of Wallabies Folau Fainga'a and Lachlan Lonergan, playing six further games in the regular season.
The 20-year-old was rewarded for his strong season with selection in the Australia A program, preferred over Feleti Kaitu'u and Matt Faessler to start against Samoa and Tonga.
The Wallabies will confirm their side on Friday morning, with Porecki's absence clearing the way for Fainga'a to likely start, with Lonergan expected to come onto the bench.
