Investec Derby hero Wings Of Eagles has been retired after suffering a career-ending injury in the Dubai Duty Free Irish Derby on Saturday.
Aidan O'Brien's colt was a shock 40/1 winner of the classic at Epsom at the start of June and aimed to become the Ballydoyle handler's fifth dual Derby winner at the Curragh.
The Pour Moi colt came with his challenge inside the final two furlongs but could not get past his stable companion Capri.
He finished a close-up third behind Capri and John Gosden's Cracksman, but it proved to be his final racecourse appearance.
A statement issued by Coolmore to Press Association Sport read: "Epsom Derby winner Wings Of Eagles was found to be lame this morning after running in the Dubai Duty Free Irish Derby at the Curragh.
"He was examined today in his box in Ballydoyle by the attending veterinary surgeon who diagnosed a fracture of his left front sesamoid. Sadly this is a career-ending injury."
Speaking on At The Races later, Aidan O'Brien said: "He pulled out very sore and when the lads X-rayed him, his sesamoid was after coming apart, it's incredible that he ran the race he did with that. We're very sorry to lose, he was unsual in that he stayed very well and quickened very well. It's one of those things, but it's a pity."
The sesamoid bones are at the back of the fetlock joint in each leg.
Wings Of Eagles, a fine looking son of a Derby winner himself in Pour Moi, made his racecourse debut at last summer's Galway Festival, finishing down the field, before opening his account at Killarney.
He kicked off his three-year-old campaign by finishing second to stablemate Venice Beach in the Chester Vase before his surprise victory at Epsom in the hands of Padraig Beggy.
Wings Of Eagles (Pour Moi -Ysoldina, by Kendor) retires with two wins from seven starts and earnings of €1,268,829.74
He made his debut at Galway last July and won his maiden at Killarney.