Godolphin trainer Mahmood Al Zarooni has admitted to administering anabolic steroids to 11 horses at the Moulton Paddocks Stables, near Newmarket, England, that tested positive for the prohibited substances.

Under the British Horseracing Authority’s (BHA) testing in training program, the horses tested positive for the prohibited substances ethylestranol and stanozolol, both anabolic steroids. Group I winner Certify, who had been pointing for the QIPCO 1,000 Guineas (Eng-I) at Newmarket next month, tested positive for ethylestranol and will not be allowed to compete in the classic.

"Ethylestranol and stanozolol are anabolic steroids and therefore prohibited substances under British Rules of Racing, at any time, either in training or racing," said BHA director of integrity, legal, and risk Adam Brickell. "Mahmood Al Zarooni has been advised of the analysts’ findings and has been visited by an investigating officer."

Brickell said Al Zarooni will be called to a disciplinary hearing at the first available opportunity