Wallabies veteran Scott Sio says the new prototype of prop in Australia's squad is pushing the old guard in the lead-up to the opening Bledisloe.

Former Wallabies coach Michael Cheika will try to plot their downfall after joining Argentina coach Mario Ledesma's staff for the Rugby Championship.

Injury concerns for Matt Toomua and Noah Lolesio's confident return in the Super Rugby AU finale have the emerging No.10 in the frame for a Wallabies debut.

Playing 99 Tests and 46 as captain, Michael Hooper will continue to lead the Wallabies in 2020 under new coach Dave Rennie.

Michael Hooper has retained the Wallabies' captaincy under new coach Dave Rennie, ahead of his 100th Test in New Zealand next month.

Jordan Petaia is in camp with the Wallabies and there are hopes he can recover from a hip injury to play in the opening Bledisloe Cup Test in Wellington.