Versatile back-rower Ben McCalman is a bench bolter for the Wallabies in a shock move for Saturday night's series decider against the British and Irish Lions.
Australia have confirmed McCalman will make his international return at Sydney's ANZ Stadium after failing to play a Test in 2012 due to injury.
The Western Force forward's inclusion in the 23-man squad presents an intriguing question over who else will line up in the Wallabies back-row and bench.
McCalman, who missed selection in Robbie Deans' initial 25-man squad six weeks ago, said he was covering blind-side flanker and No.8.
There have been question marks over incumbent No.8 Wycliff Palu's fitness and ability to overcome a lingering knee problem.
Veteran George Smith is also in the mix to play after overcoming a knee injury and Deans has said he wants improvement at the breakdown where young openside Michael Hooper was outpointed by Sam Warburton in the 16-15 second Test victory.
Deans may take a risk by playing six forwards and only two backs on the bench, including two back-rowers, or could possibly start with two ball-scavengers.
Queensland No.7 Liam Gill was influential when he came off the bench in Melbourne and could also be an option to start.