France Galop have handed out a six-month suspension to Robert Havlin.
The governing body have stated that the Newmarket jockey tested positive for banned substances when riding at Saint-Cloud for boss John Gosden on October 30 last year.
A statement from France Galop read: “The stewards of France Galop have been advised by the Medical Commission that jockey Robert Havlin’s biological sample, carried out on Saint-Cloud racecourse on October 30, 2016, revealed the presence of two prohibited substances classified as narcotics including morphine and three prohibited substances classified as psychotropic.
“Given the positive result to a narcotic and its metabolites present in the biological sample of the jockey, this is a serious breach of the rules of racing of France Galop, whose objective is to preserve the health and safety of all riders participating in a race, including their own.”
Under an international agreement, France Galop have further requested that the British Horseracing Authority also impose the sanction.
Forty-three-year-old Havlin, who has ridden four winners this year, has already confirmed his intention to appeal the ban, which dates back to January 26.