Australia's starting 15 have 345 previous test appearances, 110 of which belong to captain Nathan Sharpe, who will break George Smith's record as the Wallabies' most-capped forward.
After the Wallabies were bashed at the breakdown by the Springboks in their 31-8 loss in Pretoria, Deans has boosted his team's strength and size.
"We've looked to increase our physicality to counter the direct force that will undoubtedly be coming the other way. We know that the Pumas will be coming straight at us and will be looking to profit in the collision in the same way that the Springboks did last week. We have gone for the players we feel are best suited to that approach."
Timani has only ever come off the bench to play at No6 for the Waratahs, but Deans has picked him there to be a chief ball-runner and also keep the size of another 122kg lock, Kane Douglas, in his pack.
Back-rower Scott Higginbotham, with an injured back, was named on a 5-2 bench, while Ioane, with a sore knee, ran freely at training but is yet to have contact work.
In contrast to Australia's disruptions, the Pumas, favourites to win their first match in the expanded tournament, named an unchanged starting team for a third straight test.
Argentina v Aust
Rosario, noon tomorrow
- AAP