Australia captain Pat Cummins is still in contention to play in Thursday's second Ashes Test, even though he has yet to be named in the squad.
Cummins missed his side's win in Perth with a long-running back complaint and was subsequently omitted for this week's day/nighter in Brisbane.
But he has continued training with his team-mates at the Gabba and Australia have been careful not to formally rule him out of an eleventh hour appearance on the team-sheet.
Steve Smith appeared at the pre-match captain's press conference but gave no guarantees that he would be leading the side out.
"A whole heap of things are on the table. We'll wait and see what the wicket looks like later and from there we'll determine a playing XI," he said.
"(Cummins) looks pretty good to me, he's bowled in the nets. Obviously games are different intensity, for sure, but he's tracking nicely and he knows his body well. We'll wait and see."
Brendan Doggett, who took five wickets on debut last time out, would be the likeliest to make way if the skipper made his return, though there has been some speculation over the role of spinner Nathan Lyon.
Yorkshire-born Josh Inglis is expected to beat Beau Webster to a middle-order recall, with Usman Khawaja out injured and Travis Head ready to open again following a match-winning century as a stand-in at Perth.
