Pour Moi, the winner of the English Derby in June, was retired on Saturday after suffering a fetlock injury while exercising earlier in the week, according to a statement from Coolmore Stud in Ireland.
Trained by Andre Fabre, Pour Moi was based with Fabre's stable in Chantilly, France, when he was injured. He had not started since the English Derby and was considered the favorite for the Prix de l'Arc de Triomphe at Longchamp in October.
"Pour Moi suffered a severe over reach to his near fore fetlock during exercise at Chantilly," Coolmore said in a statement.
Pour Moi, by Montjeu, won 3 of 5 starts for Michael Tabor, Susan Magnier, and Derrick Smith. Earlier this year, Pour Moi won the Group 2 Prix Greffulhe at Saint-Cloud. He will stand at stud at Coolmore in Ireland next year.
Without Pour Moi, the Arc does not have a clear favorite, though the recent Group 1 winners So You Think (Coral Eclipse Stakes at Sandown on July 2), Meandre (Grand Prix de Paris at Longchamp on July 14), Nathaniel (King George VI and Queen Elizabeth Diamond Stakes at Ascot on July 23), and Sarafina (Grand Prix de Saint-Cloud on June 26) will be well-supported.