The Swiss Cycling Federation confirmed Wednesday that it has opened an investigation into doping allegations against Jan Ullrich.

Ullrich, who competes with a Swiss license, is accused of being supplied with performance-enhancing drugs by the Spanish doctor at the center of the Operación Puerto doping investigation in Spain.

A former Olympic champion, Ullrich was barred from competing in this year's Tour de France after being implicated in the scandal. Ullrich is alleged to have been given EPO, steroids and human growth hormone by Madrid physician Eufemiano Fuentes, who is accused of running a doping ring.

Ullrich, the 1997 Tour de France winner, has denied all charges and is actively seeking remedies in the courts to quiet speculation by doping experts about his case.

"The Puerto/Jan Ullrich dossier has been examined by Swiss Cycling and the anti-doping commission," Swiss Cycling said in a statement. "The dossier has to be completed and certain parties notified. Then the file will be forwarded to the disciplinary body in charge of doping cases."

A conviction in the case would essentially mark the end of Ullrich's career.

The 32-year-old, who has already been fired by his T-Mobile team, faces at least a two-year ban from cycling and an additional two years from the ranks of the ProTour. His case could be further complicated by a six-month suspension handed down by the German Cycling Federation in 2002 for taking the party drug ecstasy in a nightclub.