Lopeti Timani and Tom Robertson are set to make their Wallabies debuts after being confirmed in the team for the clash against Argentina.
Rebels back-rower Timani and Waratahs prop Robertson were named as Michael Cheika confirmed his bench on Friday.
Dean Mumm is set to bring up his 50th Test in the Rugby Championship clash at nib Stadium on Saturday.
The man to miss out was Brumbies wing Henry Speight, who dropped out of the squad.
The Wallabies are bottom of the Rugby Championship table after winning just one of their opening three games.