Lopeti Timani believes his physicality was sorely missed by the Wallabies in their disappointing defeat to Scotland last weekend.
Highly-rated by Wallabies coach Michael Cheika, Timani will make his first Test appearance of the year in Saturday's clash with Italy.
Timani has mainly featured this season in the lock position for club side the Melbourne Rebels but will run out in his favoured position at number eight for the Wallabies this weekend.
And Timani believes he has the potential to be one of the best number eights in world rugby and could be the missing ingredient the Wallabies need to turn around their fortunes.
"We needed someone like myself in the middle of the field," Timani told the West Australian.
"When I get my chance this week I'll make sure I bring that physicality, aggression, ball-carrying, big tackles.
"I can make a difference on the game.
"I still have a lot of stuff to work and try and improve so I can be my best, not in Australia but around the world.
"I'm feeling confident. The only thing I need to work on is my fitness.
"(Cheika) wants physicality and aggression from me. It's kind of my strength, I need to bring it to the game very week.