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French cyclist Remy Di Gregorio has been detained for questioning by French gendarmerie, a gendarmerie source said on Tuesday.

Cofidis rider Di Gregorio, who was on the Tour de France, was transferred to his hometown of Marseille after the gendarmerie raided the team's hotel early on Tuesday.

The source said Di Gregorio was being questioned with two other people after an investigation was opened last year into alleged trafficking of doping substances.

Di Gregorio, 26, who won a Paris-Nice stage last year, was regarded as the next great French climber when he started his professional career in 2005 but failed to live up to expectations.

In 2011, he joined Astana from FDJ before moving to Cofidis this season.

It was unclear whether Di Gregorio would be able to start Wednesday's 10th stage. Under French law, he can be detained for 48 hours.

Cofidis were not immediately available for comment.