Don Cossack, winner of the 2016 Timico Cheltenham Gold Cup, has been retired after suffering a setback, trainer Gordon Elliott has announced.
Owned by Michael O'Leary's Gigginstown House Stud, Don Cossack held off Djakadam to win the most prestigious prize in National Hunt racing last March.
He subsequently suffered an injury when being prepared for the Punchestown Festival but had been working towards a return to action next month.
However, Elliott reports the 10-year-old to have heat in his leg, with connections opting to retire their star performer.
Elliott told his Betfair blog: ''I am very sad to report that Don Cossack has suffered a setback and will now be retired.
"We found that he had a bit of heat in his leg yesterday and we've made the decision to call time."