In an interview with the German news magazine Focus, Ullrich denied getting any "special advantage" from his actions, Sky News reported Saturday. But he acknowledged getting chemical assistance from Dr. Eufemio Fuentes, a Spanish sports medicine specialist who has been convicted of doping charges.
Ullrich won the tour in 1997. In 2000, he took gold and silver medals at the Sydney Olympics.
"Yes I did undergo Fuentes' treatments," Ullrich told Focus. "Almost everybody back then took performance-enhancing substances. I didn't take anything which the others were not taking. For me, betrayal only begins when I gain an advantage, but that was not the case."
The Tour de France, the world's most difficulty cycling race, has been buffeted by doping scandals, including the admission by seven-time winner Lance Armstrong that he used banned substances.