LONDON -- Tour de France champion Floyd Landis tested positive for high levels of testosterone during the race, his Phonak team said Thursday on its Web site.



The statement came a day after the UCI, cycling's world governing body, said an unidentified rider had failed a drug test during the Tour.



The Swiss-based Phonak team said it was notified by the UCI on Wednesday that Landis' sample showed "an unusual level of testosterone/epitestosterone" when he was tested after stage 17 of the race last Thursday.



Landis made a remarkable comeback in that Alpine stage, racing far ahead of the field for a solo win that moved him from 11th to third in the overall standings. He regained the leader's yellow jersey two days later.



"The team management and the rider were both totally surprised of this physiological result," the Phonak statement said.



Phonak said Landis would ask for an analysis of his backup "B" sample "to prove either that this result is coming from a natural process or that this is resulting from a mistake."



Landis has been suspended by his team pending the results. If the second sample confirms the initial finding, he will be fired from the team, Phonak said.



Landis failed to show up for a one-day race in Denmark on Thursday, a day after missing a scheduled event in the Netherlands.



Dutch news agency ANP quoted his teammate Koos Moerenhout as saying that Landis had pain from his hip problem and had gone to see his doctor in Germany.



He plans to have hip replacement surgery this fall to ease pain in the arthritic joint still aching from a 2003 crash during a training ride.



"We were told by the other two riders that he couldn't join because he was traveling with team manager [John] Lelangue to his doctor in Germany," event organizer Theo van der Westerlaken said. "That's all we know."



Landis did take part in a criterium race Tuesday in Stiphout, Netherlands, winning the event.



Landis won the Tour de France on Sunday, keeping the title in U.S. hands for the eighth straight year after Lance Armstrong's record seven victories.



On the eve of the Tour's start, nine riders -- including pre-race favorites Jan Ullrich and Ivan Basso -- were ousted, implicated in a Spanish doping investigation.



(The Associated Press and Reuters contributed to this report.)



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