Some of the testosterone found in Tour de France winner Floyd Landis' 'A' sample is from an external source and not his body, The New York Times reported today.
An unidentified International Cycling Union official revealed the carbon isotope test on the first of Landis' two urine samples taken after his 17th stage win in last month's tour contains synthetic testosterone.
The results, if confirmed by Landis' B sample could see Landis the first Tour champion to be stripped of his title.
The 30-year-old American, who could also be banned from the Tour for two years, has protested his innocence to the UCI.
'I'd like to make it absolutely clear that I'm not in any doping process,' he maintained on Friday.
