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Patrick Schamasch, the International Olympic Committee's medical director, said in a separate telephone interview that the high testosterone level ``could potentially lead to an anti- doping violation.''
News media, including Reuters, said Landis had failed a doping test.
Triple Tour de France winner Greg LeMond hit out the corruption of cycling after Floyd Landis failed a dope test which could see him become the first champion to be stripped of his crown.
Landis, who won the 2006 race last weekend, tested positive for the male sex hormone testosterone after his sensational win in the 17th stage of this year's race which he won after powering away on a 130km solo breakaway.
But on Thursday his Phonak team confirmed that the 30-year-old American had returned a positive test in the immediate aftermath and would be sacked if the B sample confirmed the result.
"I'm devastated and extremely disapointed," LeMond told AFP.
"I can't imagine the disappointment for Floyd and his family. I really did believe Floyd was clean.
The problem is the sport is corrupt and it corrupts everybody. I still believe it was one of the cleanest Tours ever. But is it 100-percent clean? No.
"You will always find riders who transgress the laws. I really did believe Floyd was not among them, that he was clean. Hopefully, he will be able to step up and tell the truth.