Garmin Sharp's Ryder Hesjedal has admitted to doping.
The Canadian was a mountain biker in the Rabobank Development team but has said that he was shown in 2003 how to use take EPO, which is banned in the sport, by Michael Rasmussen, who has a new book out.
Hesjedal, who was called to testify by the US Anti Doping Authority in the case against former team-mate Lance Armstrong, said in a press statement: "More than a decade ago I chose the wrong path.
"Even though those mistakes happened more than 10 years ago, and they were short-lived, it does not change the fact I made them and I have lived with that and been sorry for it ever since.
"I believe that being truthful will help the sport continue to move forward, and over a year ago when I was contacted by anti-doping authorities, I was open and honest about my past."
The Canadian and former Giro D'Italia winner is supported by his team who have said: "As we have said from the beginning, Slipstream Sports was created because we wanted to build a team where cyclists could compete 100% clean. And, as we have previously stated, our expectation is that anyone in our organization contacted by any anti-doping authority must be open and honest with that authority.
"Ryder is no exception and a year ago when he was contacted he cooperated fully and truthfully testified to USADA and CCES. For this reason and because of our desire for 100 per cent truth and reconciliation in the sport of cycling, we support him."