A cyclist in this year's Tour de France has tested positive for doping, the sport's world governing body said Wednesday.

The initial positive test must now be confirmed by an analysis ofa backup sample, theUnion Cycliste Internationale (UCI) said in a statement.

It saidthe rider's name, teamand nationality would not be revealed until the testing process was complete.

The UCI said all involved parties have been notified of the positive test, as havenational and world anti-doping authorities.

The Tour de France wrapped up Sunday with American Floyd Landis capturing the three-week cycling race after the final stage through central Paris and down the city'sfamed Champs Elysée.

Cycling spectacle marred by doping controversy

The opening of the Tour was rocked by a doping scandal, with several of the sport's top riders barred from the race after being implicated in a major investigation in Spain.

Among those pulled from the race were two of thecycling's most accomplished riders,Jan Ullrich and Ivan Basso.

Ullrich, the 1997 Tour de France champion, was suspended from the race along with T-Mobile teammate Oscar Sevilla and team sporting director Rudy Pevenage.

Ullrich also placed second five times in the Tour de France, including three times to seven-time champion Lance Armstrong, who retired after last year's race.

Basso, who placed 11th in 2002, seventh in 2003, third in 2004, and second in 2005, was also barred from this year's Tour, as wereSpanish racers Francisco Mancebo and Joseba Beloki. Basso was a member of the CSC team.

The names of Ullrich and Basso turned up on a list of 56 cyclists who allegedly had contact with Spanish doctor Eufemiano Fuentes. Cyclists allegedly went to his Madrid clinic to have blood extracted for doping or to collect performance-enhancing drugs.

Nearly 100 bags of frozen blood and equipment for treating blood were found at the clinic, along with documents on doping procedures performed on cyclists.