It was during a house search at the stable Arkea-Samsic's hotel in Meribel, after the 17th stage of the classic stage race, that the police found health products, including substances and equipment that can be linked to doping.
The detainees, according to AFP a doctor and a physiotherapist, must have belonged to the star Nairo Quintana's personal team, according to Reuters.
Quintana, who has won both the Giro d'Italia and Spain, says in a statement that no doping substances have been found and that he has neither now nor before had anything to hide.
According to AFP, Nairos Quintana's brother Dayer, who also rode the Tour de France, is one of the designated cyclists.
Marseille's prosecutor says in a statement that the investigation of suspected doping continues.