All-rounder Mitchell Marsh was added to Australia's 13-man squad on Thursday for next week's third Test in Perth as the home side bid to clinch the Ashes. Selectors brought in West Australian Marsh, brother of Adelaide Test centurion Shaun Marsh, to offer pace back-up to the front-line fast-bowling attack of Mitchell Starc, Josh Hazlewood and Pat Cummins. Mitchell Marsh last played a Test on Australia's tour of India in March and required a full shoulder reconstruction after an injury in the Bangalore Test. Paceman Jackson Bird has been retained in the Test squad as the first reserve fast bowler. Australia's squadSteve Smith (capt), David Warner, Cameron Bancroft, Usman Khawaja, Peter Handscomb, Mitchell Marsh, Shaun Marsh, Tim Paine, Mitchell Starc, Pat Cummins, Josh Hazlewood, Nathan Lyon, Jackson Bird.