Pace bowler Brett Lee sat out training on Saturday because of his injured left ankle and remains doubtful for the first Test against Sri Lanka starting on Monday.
Lee complained of soreness in his ankle, the same ankle that was operated on last year, during Australia's recent practice match against a Sri Lanka President's XI.
Lee was immediately taken to hospital and x-rays showed no structural damage.
Lee had been in explosive form, taking five wickets in the game, and was almost certain to share the new ball with Jason Gillespie in the opening Test.
Australia coach John Buchanan said Lee would be given until Sunday to prove his fitness before the tourists finalised their team.
"There is obviously concern there but that is the reason why he is not out here today," said Buchanan.
"In a bowling sense he does not actually need to bowl so we are trying to give him an opportunity to get right for Monday."
"We will make our final decision tomorrow and that will be as much based on him and his feelings as Alex's (Kontouri), the physio, as well as the captain and selectors."
If Lee does not play, Michael Kasprowicz or Brad Williams will replace him. Australia have not yet decided whether to play two or three fast bowlers.
Buchanan ruled out calling for a replacement from Australia at this early stage.
Lee has taken 139 wickets at 31.66 in 37 Tests.
