David Millar has been formally placed under investigation as part of a doping probe into his Cofidis team.
Millar will not race in this year's Tour de France
Millar has not been charged, but is being investigated for "acquiring and holding poisonous substances," his lawyer Paul-Albert Iweins said.
The 27-year-old Scot, who has been barred from competing in this year's Tour de France, was released after appearing in court on Thursday.
Iweins said Millar had told the court west of Paris that he had used EPO.
"He said that he took three EPO cures of one-week each in
2001 and 2003," Associated Press reported Iweins as saying.
Cofidis have been under investigation since seven of its riders - including Phillippe Gaumont and Robert Sassone, Mederic Clain and Marek Rutkiewicz - were charged with doping offences.
They have all left or been sacked by the team since.
Former physio Boguslaw Madejak and an ex-manager of their third division team, Oleg Kozlitine, have also been sacked after the Paris judge investigating the case pressed charges.
Millar, who has never failed a dope test, was detained by police last week after team-mate Gaumont said he had taken banned substance EPO.
The Scot might now be dropped by the British Olympic team for Athens where he had hoped to race in the road race, time trial and in the individual pursuit on the track
However, the BOA are obliged to wait for either the British Cycling Federation or the International Cycling Union (UCI) to make the first move.
"We have 192 athletes selected for the Olympics and all athletes' selection is contingent on their continued nomination by their national governing bodies and their continued eligibility for team GB," said BOA spokesman Philip Pope.
"We are not aware of any of our 192 athletes having committed a doping offence.
"Until or unless any national or international federation provides us with information to the contrary, all 192 athletes remain selected athletes for team GB.
"That being said we are keeping a close eye on developments."