Mitchell Starc has pulled up well and will play the Ashes series finale that starts at the SCG on Thursday.
Australia have confirmed Starc, who missed the fourth Test because of a bruised heel, will play the dead rubber.
"Starcy pulled up pretty well this morning. He says he's ready to go," Steve Smith said.
"The break he's had from bowling has helped his heel heal. It's coming along nicely so he's confident and you've also got to take the player's word sometimes.
"Hopefully he gets through and he's fine."
Starc has claimed Jackson Bird's place in the team.
It means left-arm spinner Ashton Agar, who was added to Australia's squad for the fifth Test, will be left out of the XI for the fifth Test.
Bird, Agar and Peter Handscomb have been released to their respective Big Bash League clubs.
Smith, who skipped Tuesday's training session because of a sore back, confirmed he'll be right to play the SCG dead rubber.
"A little bit stiff but nothing I haven't dealt with before," he said.
"I'll have a good hit today, a catch, and I'll be fine tomorrow."
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