Rule of Law has already enjoyed a successful season

The horse, who is owned by the Sangster family, was fourth in the Derby at Epsom but disappointed in the Irish equivalent on his last start.

"His white cell count is high so he will not run but hopefully the problem can be rectified over the weekend," said Ben Sangster

Godolphin's ante-post favourite Rule Of Law heads a field of 10 for the race.

The horse, who will be partnered by Australian jockey Kerrin McEvoy, is currently priced at around 2-1.

He was an impressive winner of the Great Voltigeur Stakes last time out and will be hoping for another success, despite the step up in trip.

Quiff, the impressive 11-length winner of the Yorkshire Oaks and general second-favourite, has been declared despite worries over the drying ground on Town Moor.

The horse, who is trained by Sir Michael Stoute and will be the mount of Kieren Fallon, is bidding to be the first filly since User Friendly in 1992 to win the world's oldest Classic.

Connections had been hoping for some rain or that some watering would be done on the track but John Sanderson, chief executive at the track, is not planning to water.

Stoute, who is seeking his first St Leger win, also saddles Maraahel.

Latest St Leger odds 7-4 Rule of Law 100-30 Quiff 5-1 Let the Lion Roar 11-2 Maraahel 7-1 Tycoon 14-1 bar Odds: William Hill 09/09/04

Let The Lion Roar, who has finished behind Rule Of Law four times already this season, will try to emulate his half-brother Millenary, who was successful on Town Moor in 2000.

Aidan O'Brien has three runners - Tycoon, Go For Gold and Mikado.

Stable jockey Jamie Spencer is in action at Leopardstown so Darryll Holland, Seb Sanders and Jimmy Fortune take the rides respectively.

Tycoon was third in the Irish Derby and he was an unlucky sixth in the King George VI and Queen Elizabeth Diamond Stakes.

Holland has a superb record in the race after finishing second and third in the last two runnings with Highest and Phoenix Reach.

The Mick Quinlan-trained Frank Sonata takes his chance after winning the Listed July Trophy at Haydock but Albinus, who was third in that race, needs good ground to go up against him again.

The Czech-trained Darsalam, a rank outsider, completes the line-up.