Winning Rupert, beaten as favourite in the Magic Millions Guineas, has been found to have a bone chip in a knee which will need surgery.
Katelyn Mallyon and Emily Finnegan are among 12 riders who will compete in the inaugural International Mixed Doubles Jockeys Challenge in Macau.
Trainer Cindy Alderson is planning to kick off O'Lonera's latest campaign in the $100,000 VOBIS Gold Star at Moonee Valley.
Dual Group One winner and Cox Plate placegetter Yankee Rose has returned a positive result to an anti-inflammatory from her second in the Flight Stakes.
Il Cavallo, a close relation to Starspangledbanner, will return to the track after a failed stud career in New Zealand.