Godolphin trainer Mahmood Al Zarooni has been charged after tests found traces of anabolic steroids in 11 of his horses.
Al Zarooni will appear before a British Horseracing Authority (BHA) disciplinary panel on Thursday.
On Monday, the trainer admitted making "a catastrophic mistake".
The 37-year-old faces multiple counts related to prohibited substances, medical records and conduct prejudicial to horse racing.
Al Zarooni could lose his training licence in what has been described as one of the biggest doping scandals in British racing history.
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