Galileo Rock, placed in both the English and Irish Derbies, is one of 11 horses declared in what looks a wide-open renewal of the Ladbrokes St Leger at Doncaster on Saturday.

The David Wachman-trained colt will be trying to make it third-time lucky after taking third spot behind Ruler Of The World at Epsom, and was second to Trading Leather at the Curragh.

Aidan O'Brien, who bids to win the world's oldest Classic for a fourth time saddles Queen's Vase winner Leading Light and the lightly-raced Foundry. He booked his place when runner-up on his seasonal debut in the Great Voltigeur Stakes at York.

O'Brien's son Joseph rides Leading Light with Ryan Moore booked for Foundry while the Ballydoyle trainer removed his other entry, Eye Of The Storm.

John Gosden, responsible for three of the last six winners of the world's oldest Classic, relies on Excess Knowledge. The Gordon Stakes second will be ridden by owner Khalid Abdullah's recently appointed retained jockey James Doyle.

As Gosden has withdrawn Feel Like Dancing, his stable jockey William Buick will team up with Libertarian for Godolphin and trainer Charlie Appleby.

Appleby is also responsible for Cap O'Rushes. The Gordon Stakes winner is the mount of Mickael Barzalona, who was victorious 12 months ago on Encke.

Godolphin have a third Leger contender in Secret Number from Saeed bin Suroor's stable.

The only filly in the field is Investec Oaks heroine Talent, trained by Ralph Beckett, while the Brian Meehan-trained Great Hall, Andrew Balding's Havana Beat and Ralston Road, trained by Pat Shanahan, complete the field.

London Bridge was the third withdrawal at the final declaration stage.

Live coverage of the Ladbrokes St Leger on Saturday Sport on RTÉ Radio 1.