Floyd Landis has vowed to clear his name after the disgraced American was sacked by his Phonak team following confirmation he had tested positive for excessive levels of testosterone during this year's Tour de France.

The International Cycling Union (UCI) has confirmed that a B sample taken from Landis, who ended up winning the event, had tested positive, backing up the A sample which had found an "unusual" level of testosterone/epitestosterone.

Within minutes of the verdict, Phonak released a statement saying they had terminated the 30-year-old's contract for "violating the team's internal code of ethics".

Landis is now expected to be stripped of his 2006 title and faces a two-year suspension from the sport.

But he belligerently maintains his innocence, claiming his body naturally produces high levels of testosterone and has vowed to contest the charges.

"I have never taken any banned substance, including testosterone," he said on his own website,

"I was the strongest man in the Tour de France, and that is why I am the champion.

"I will fight these charges with the same determination and intensity that I bring to my training and racing.

"It is now my goal to clear my name and restore what I worked so hard to achieve."

Landis' attorney, Howard Jacobs, was also in bullish mood ahead of what is likely to be a lengthy appeal process.

"At this point in time, I am waiting to receive the full laboratory documentation for the B test," he added.

"In consultation with some of the leading medical and scientific experts, we will prove that Floyd Landis' victory in the 2006 Tour de France was not aided in any respect by the use of any banned substances."

The decision to strip him of the Tour de France title now rests with the UCI but it is expected the win will be handed to Oscar Pereiro, who finished second, 57 seconds behind. Landis would become the first winner in the history of cycling's leading race to lose his crown over doping allegations.