Naming his first squad for the year on Sunday, Rennie said while he wanted Australia to play an attractive brand of rugby, they also needed to make a shift from form seen during Super Rugby. They also had to show 'a dark side', he said.
Given the way Australian sides were able to win only two of 25 games against New Zealand sides, Rennie said the side had a lot to do around defence.
Rennie explained his dark side reference by adding it was about ruthlessness, something they had talked about often last year, his first at the helm of the side.
"We have a lot of good young men, and we want them to become different creatures when they cross the chalk onto the field…aggressive, dominant," he said.
Before playing the Rugby Championship, Australia will play a three-Test series with France, including a midweek Test.
The squad has 11 new players while 14 others of the 38 named have played fewer than 10 Tests.
The Wallabies squad is: Allan Alaalatoa, Tom Banks, Angus Bell, Filipo Daugunu, Pone Fa’amausili, Lalakai Foketi, Jake Gordon, Reece Hodge, Michael Hooper (c), Len Ikitau, Feleti Kaitu’u, Andrew Kellaway, Marika Koroibete, Rob Leota, Noah Lolesio, Lachlan Lonergan, Tate McDermott, Fraser McReight, Andy Muirhead, Isi Naisarani, James O’Connor, Brandon Paenga-Amosa, Hunter Paisami, Izaia Perese, Matt Philip, Lukhan Salakaia-Loto, Scott Sio, James Slipper, Darcy Swain, Lachie Swinton, Sitaleki Timani, Matt To’omua, Taniela Tupou, Rob Valetini, Michael Wells, Nic White, Harry Wilson, Tom Wright.