By Racinguk.com staff
Sir Michael Stoute's Expert Eye is the general 4-7 favourite after the defection of one of his principal rivals in the Jim Bolger-trained Verbal Dexterity.
Bolger spoke in glowing terms about his youngster following a dominant victory in the National Stakes at the Curragh and he was well fancied to provide the trainer with his sixth Dewhurst success.
But his trainer said on Thursday: "His scope wasn't clean this morning."
Asked whether Verbal Dexterity was now finished for the season, Bolger added: "I hope not. We'll be looking at the race in Saint-Cloud (Criterium International) and the Racing Post Trophy in Doncaster."
Despite Verbal Dexterity's enforced absence, the Glebe House handler is still represented in the Dewhurst with likely outsider Theobald.
Aidan O'Brien, who won the Dewhurst for the fifth time with this year's dual 2000 Guineas hero Churchill 12 months ago, has four contenders.
Emaraaty is the general 4-1 second favourite.