Saeed bin Suroor will assume temporary control at Moulton Paddocks while Godolphin seek a new trainer.
The British Horseracing Authority is preparing to release a statement following reports last year's St Leger winner Encke is one of a number of horses to test positive for a banned substance at the yard of Mahmood Al Zarooni.
Godolphin's Tawhid fared best of the British-based runners in the Mehl-Mulhens-Rennen - German 2000 Guineas at Cologne behind surprise winner Peace At Last.
Loch Garman and Trading Leather are among a team of four from Jim Bolger's stable left in the Tattersalls Irish 2,000 Guineas at the Curragh on Saturday.
Johnny Murtagh is aiming for a dream start to his training career with Fort Knox in the Tattersalls Irish 2,000 Guineas at the Curragh on Saturday.
Olympiad could go on a retrieval mission in the Ascot Stakes at the Royal meeting following his Chester Cup disappointment.
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