In Her Time is in doubt for the Hong Kong International Sprint after being found to have a quarter crack in her left front foot.
The Hong Kong Jockey Club said the Australian mare would be re-examined on Sunday morning, hours before the race.
Trained by Kris Lees, the Group One-winning sprinter is Australia's only entrant at the International meeting.
Two other horses, Called To the Bar and Lucky Lilac have been passed fit to run in the Vase (2400m) after showing signs of lameness on Friday.
Melbourne Cup runner-up Prince Of Arran is one of the favourites for the Vase.