American cyclist Tom Danielson says he tested positive for synthetic testosterone in an out-of-competition test performed last month.
Danielson, a former teammate of disgraced cyclist Lance Armstrong, said on Twitter that he did not take any banned substance.
Danielson, who rides for the Cannondale Garmin team, added that he was notified by the U.S. Anti-Doping Agency that a sample collected on July 9 returned positive.
As a result, Danielson withdrew from the Tour of Utah, where he was set to compete this week.
Danielson wrote "I would never ever take anything like this especially after everything I have gone through the last years. This makes absolutely no sense."
Danielson testified as part of USADA's investigation into Armstrong and US Postal and has admitted to doping in the past.
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