Godolphin trainer Mahmood Al Zarooni could lose his training licence when he faces a disciplinary panel of the British Horseracing Authority tomorrow.
Yesterday, he admitted making "a catastrophic mistake" after 11 of his horses were found to have contained traces of anabolic steroids.
The 37-year-old has officially been charged with rule breaches related to prohibited substances, duty to keep medication records, and conduct prejudicial to racing.
The hearing will be held at 2.30pm at BHA headquarters in London.
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The size of the proposed penalty has not been disclosed.