John Hastings has backed lion-hearted Peter Siddle to recover in time for the Perth Test and says his fellow Victorian quick deserves the chance even if it costs him his own shot at a Test debut.
While Mitchell Starc, 12th man for the first two Tests, is expected to replace the injured James Pattinson, Hastings is one of three other pacemen brought in as cover for weary duo Siddle and Ben Hilfenhaus, along with Mitchell Johnson and Josh Hazlewood.
Siddle in particular bowled himself to near-exhaustion on Monday's final day of the drawn second Test against South Africa in Adelaide.
And while a debut in the decider, starting on Friday at the WACA, would be a dream for Hastings, who spent all of last summer sidelined by a shoulder injury, he said it would be a shame if Siddle or Hilfenhaus missed out.
"They're the first two picked, aren't they?" Hastings said in Melbourne, before flying to Perth to join the Australian squad.
"For me it will be about doing whatever role I possibly can that the team needs, going over there and training my backside off and then if I get the chance, I get the chance.
"I'm well and truly ready.
"Hopefully those guys pull up (ready to play).
"As I said, they deserve the crack at trying to win this Test series."
Hastings labelled Siddle's effort inspiring and expected him to have the resilience to bounce back.
"I think he'll be fine. He's a very tough character. I know the way he looks after his body really well," he said.
"I'm sure he'll give himself every opportunity to play and have the last crack at South Africa."
But Hastings backed himself to perform with bat and ball if given the chance.
He scored 80 and took 5-66 in the first innings of Victoria's Sheffield Shield loss to South Australia, completed on Monday.
Hastings also boasts solid WACA form, having taken match figures of 7-87 against WA earlier this year.
"I'm very confident in my own skill set," he said.
"I've backed myself 100 per cent my whole career and that's not going to change if I get the opportunity on Friday."