O'Brien names five for Leger
Changingoftheguard, beaten by a head in the Ebor last week, is another likely contender while Johann Zoffany, Von Jawlensky and Rockhampton are likely pacemakers.
John Dunlop is searching for his fourth victory in the race and still has Tactic in the reckoning but there has been no confirmation regarding this for the Doncaster stellar event.
Angus Gold, racing manager to owner Hamdan Al Maktoum, said: "Mr Dunlop wanted to leave the horse in the Ladbrokes St Leger and I will have to discuss whether he takes his chance with the trainer and Sheikh Hamdan.
"I think that his run in the Gordon Stakes was fair but it was a better effort when he was second to Kite Wood at Newmarket. He's a nice horse but he has a bit to find on the form book as things stand.
Kite Wood is the market leader for the coveted prize.