Frankie Dettori faces a France Galop inquiry on Tuesday after testing positive for a banned substance at Longchamp in September.
His solicitor Christopher Stewart-Moore released a statement last week which said the jockey would appear before the medical committee of the French racing authority in Paris.
It has been widely reported Dettori failed the test due to the presence of cocaine and faces a six-month ban, which is expected to be reciprocated by racing jurisdictions worldwide. Stewart-Moore declined to name the substance involved, but said it was "not a performance-enhancing drug".
Dettori had four rides at Longchamp on September 16, a day of major trials for the Prix de l'Arc de Triomphe meeting the following month. France Galop have not commented on proceedings and, in previous similar cases, have not issued a statement before the hearing.
Dettori made the headlines last month 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.
A number of bookmakers have now, however, removed Dettori from their betting for next year's jockeys' championship.
Kieren Fallon was banned six months by France Galop in 2006 after returning a positive test for a metabolite of a banned substance. France Galop then banned him a further 18 months after a second positive test in August 2007.
Dettori himself was cautioned by police for possession of cocaine in 1993.
Asked by the Daily Mail in 2010 about his biggest regret, he said: "Getting caught with cocaine in 1993. I was on all the front pages and put my family through hell.
"I was cocky and had too much too soon. It made me grow up."
30 July 2015Cover up for Goodwood defence
Clown gets serious at Galway
Eddery aiming for Mile high
Fox finale for Hughes
Ivory unveils strong Stewards' team
Treacy sent for scans
Stars on show in Nassau
Lynam 'proud' of Sir Peter alliance
Tributes pour in for O'Sullevan
It's Shanahan's turn at Galway
Sir Peter O'Sullevan dies, aged 97
Kachy not for catching in Molecomb
No Sussex regrets for O'Brien
Solow flying high at Goodwood
Highland reels in Gordon rivals
Shalaa in top trim for Richmond
Dunlop excited by Trip to Goodwood
29 July 2015Fortune favours Twiston-Davies
Peacock pair vie for Galway glory
Moviesta gets King George go-ahead
Karakontie has Deauville date
Dog delivers for Mullins and Walsh
Tint proves Topaz jewel
Maguire back in the saddle
Blue back with a bang
Tough Toormore takes Lennox glory
All roads lead to Arc for Postponed
Logan shines for Kirby
Frankie grabs Gold at Goodwood
So seeking Sussex success
28 July 2015King targeting Molecomb reign
Mullins hoping Bob is back
Wayman lands BHA role
Medrano eyeing Gordon glory
Options open for Force
Group race aim for Nisser
Modem takes control
Solitaire shines in Weld double
Bach in business
Vastonea out to sparkle in Topaz
Tanzeel unlikely for Cup date
Birch bids for Vintage victory
Toor targets Lennox triumph
Gleneagles misses Solow clash
Charlton eager for Golden Test
27 July 2015Modem takes control
Bach in business
Morny 'ideal race' for Gutaifan
Fahey ponders options for Guest
Perth double-header a washout
Sovereign option for Kodi
Salisbury option for Salvo
Group One trio top Nassau entries
Rain claims Tuesday Perth card
Perth card in doubt
McDonald nets Carlisle hat-trick
Mondialiste impresses in Pomfret
Injury in stalls forces Pilot out
Coleman lands Ferguson role
Gutaifan takes Papin honours
O'Brien plots Goodwood Air raid
Toormore seeks Lennox redemption
Buratino to take flight in Phoenix
Sovereign too soon for Elm Park