Swiss authorities have begun a doping investigation relating to Jan Ullrich, which could lead to a lifetime ban if he is found guilty.
Ullrich was forced to pull out of this year's Tour de France
The 1997 Tour de France champion is German but has Swiss residence and rides on a licence issued by the Swiss Cycling Federation.
Ullrich, who says he is innocent, was fired by his team T-Mobile after being linked to the Spanish doping scandal.
He has a previous doping conviction and, if found guilty, faces a life ban.
If the authorities do not consider his first conviction, he could still be handed a two-year ban.