McKenzie said it was a tough call to bench Genia but White deserved the chance.
"The fact that Will has captained his country shows what high regard we hold him in and while he is naturally disappointed I also know how competitive he is and I've got no doubts he will train himself to a standstill to bounce back as a better player,'' McKenzie said.
"We've spoken about what areas we believe he can continue to improve and evolve his game and he was receptive to going back and addressing those things.
"In the end, it wasn't an easy decision because he is undoubtedly a world class player.
"However, we also feel Nic has earned an opportunity to start and will add his own uniqueness and point of difference to how we want to play this game.
"Nic has had a great season with the Brumbies and has brought his own brand of energy and hard work to the Wallaby group.''
Wallabies:
James Slipper, Stephen Moore, Ben Alexander, Rob Simmons, Kane Douglas, Scott Fardy, Michael Hooper, Ben Mowen (capt), Nic White, Quade Cooper, Nick Cummins, Christian Leali'ifano, Adam Ashley-Cooper, James O'Connor, Israel Folau.
Bench: Saia Fainga'a, Scott Sio, Sekope Kepu, Sitaleki Timani, Ben McCalman, Will Genia, Matt Toomua, Tevita Kuridrani.