All-rounder Mitch Marsh has been named to play for Australia in the third Ashes Test at the WACA.
Marsh has come into the side for middle-order batsman Pete Handscomb.
England have gone in unchanged.
Handscomb has made 62 runs at an average of 20.66 and has visibly struggled against the trickery of Jimmy Anderson.
Marsh was seen in fielding drills ahead of play.
Marsh averages 21.74 with the bar at Test level, and 37.48 with the ball.
He has made some big scores for Western Australia with the bat, with a 95 and 141 among them.
Marsh has only recently been cleared to bowl after recovering from a shoulder injury.
Full Australia XI:
David Warner, Cameron Bancroft, Usman Khawaja, Steve Smith (c), Shaun Marsh, Mitch Marsh, Tim Paine (wk), Mitch Starc, Pat Cummins, Josh Hazlewood, Nathan Lyon.
Full England XI:
Alastair Cook, Mark Stoneman, James Vince, Joe Root, Dawid Malan, Moeen Ali, Jonny Bairstow, Chris Woaks, Stuart Broad, Craig Overton, Jimmy Anderson