Frankie Dettori is set to face a France Galop inquiry next week after testing positive for a banned substance at Longchamp in September.

Solicitor Christopher Stewart-Moore released a statement on behalf of Dettori revealing the news that the Medical Committee of the French authority are planning a hearing.

The statement, issued to Press Association Sport, said: "On behalf of Frankie Dettori I can confirm that, as a consequence of a positive test at Longchamp on September 16 2012, he will be the subject of an inquiry by the Medical Committee of France Galop next week."

It continued: "In compliance with, and out of respect for, the regulations of France Galop, he will not be commenting further until the France Galop procedures have been completed."

Dettori had four rides at Longchamp on September 16, a day of major trials for the Arc meeting the following month, including Marco Botti's Joshua Tree, who was third in the Prix Foy, and John Hammond's Sarah Lynx, who finished last in the Prix Vermeille.

His other two rides were for Godolphin, going down by just a head on Farhh in the Prix du Moulin won by Moonlight Cloud, and finishing third on Willing Foe in the Prix Gladiateur.

France Galop have not commented on proceedings and in previous similar cases they have not issued a statement before a hearing.

The Italian made the headlines last month when his 18-year association with Godolphin came to an end, with the three-times champion jockey planning to ride as a freelance in 2013.

Bookmakers Stan James have removed him from their betting for next year's jockeys' championship, for which he was a 12-1 shot.

Dettori would not be the first high-profile jockey to fall foul of the French authorities, Kieren Fallon having been banned for six months in 2006 after returning a positive test for a metabolite of a banned substance, and receiving a further 18 months after a second positive in August 2007.