updated 9:37 a.m. ET July 31, 2006

LOS ANGELES - Floyd Landis was set to make a triumphant post-Tour de France appearance Friday on the “Tonight Show.” Instead, the cyclist might end up as comedy fodder for host Jay Leno.

Landis, whose victory was put in doubt after his team said he tested positive for high testosterone levels, won’t appear on the NBC talk show as planned, Tracy St. Pierre, a network spokeswoman said Thursday.

The show was informed by a Landis representative that he was still in Europe and unavailable, St. Pierre said. The “Tonight Show” remains interested in having him on, she added.

On Thursday, Landis’ Tour victory was thrown into question by a positive test for high testosterone following his gritty performance in stage 17 of the race.

The Phonak team has suspended Landis, pending results of the backup “B” sample of his drug test.

MORE FROM TOUR DE FRANCE

Tour de France Section Front

Contador defied all, including Lance Armstrong lambastes Contador on Twitter Contador's reign on Tour expected to last In his return, Lance shows a more human side Contador says he ‘never had admiration’ for Lance Astarloza facing 2-year ban after positive B test Opinion: When it counted, Armstrong came through NYT: In the end, France is in love with Lance Spanish Vuelta gets more TV coverage in US   Slideshow from the 2009 Tour de France Tour de France Section Front   Add Tour de France headlines to your news reader: