Jockey Frankie Dettori faces a six-month ban from riding when the stewards of France Galop meet in Paris on Tuesday
The Italian tested positive for a prohibited substance at Longchamp on 16 September, and last month the medical commission of the French racing authority passed its findings to the stewards for their consideration.
Dettori was temporarily suspended from riding in France with immediate effect on medical grounds with the 41-year-old accepting their conclusions "without reservation".
The jockey had four rides at the Prix de l'Arc de Triomphe trials meeting after which the sample was returned.
Dettori made the headlines in October when his 18-year association with powerful owners Godolphin came to an end, with the three-times champion jockey planning to ride as a freelance in 2013.
Perhaps the most recognisable face in British racing, Dettori's finest day in the saddle arguably came at Ascot in 1996 when he went through the card, riding all seven winners - a feat which has since been tagged 'The Magnificent Seven'.
Any ban could be recognised by racing jurisdictions worldwide.