Triple Crown aspirant Camelot is one of 16 remaining entries for the Ladbrokes St Leger at Doncaster.
Aidan O'Brien's unbeaten colt has already secured glorious victories in the 2000 Guineas at Newmarket and the Investec Derby at Epsom and will aim to become the first horse since Nijinsky in 1970 to complete the Classic hat-trick on Town Moor.
Last seen winning the Irish Derby at the Curragh in June, the son of Montjeu came through a recent racecourse gallop at Leopardstown with flying colours and will be long odds-on to become a legend of the turf on September 15.
Camelot is one of six remaining possible runners for the powerful Ballydoyle team, with Grand Prix de Paris winner Imperial Monarch, Chamonix, David Livingston, Father Of Science and Offer the other contenders.
John Gosden has a well documented strong hand, with the Clarehaven maestro responsible for five possible runners. Last week's Great Voltigeur winner Thought Worthy could be joined by Irish Oaks heroine Great Heavens, Shantaram, Michelangelo and Dartford.
Thought Worthy is owned by George Strawbridge and his racing manager James Wigan said: "I would say Thought Worthy is a likely runner in the St Leger. He put in a very gutsy performance in the Great Voltigeur Stakes last week when he really put his head down and tried.
"Dynaformers have a habit of improving. Thought Worthy is a lovely looking individual and physically he has come on significantly since his run at Royal Ascot. His brother Lucarno won the St Leger and Thought Worthy really tries and gallops so you never know."
Hugely impressive Melrose Stakes winner Guarantee could become a first Leger runner for trainer William Haggas, while Encke, Thomas Chippendale, Ursa Major and Derby runner-up Main Sequence complete the high-class list, although the latter isn't a certain starter.
Trainer David Lanigan said: "He's in the Irish Champion Stakes, but he won't run there. The two options for him are the St Leger and the Prix Niel in France. I need to discuss things with the owners and then make a final decision."