The 27-year-old, sacked by Team T-Mobile in July after abnormal levels of testosterone were found in his blood, says he doped while preparing for the 2000 world champs in Plouay, France.

He was part of the German Under-23 team, but pulled out of competing a few days before the championships and he says officials in the team knew he doped.

Sinkewitz, who has previously revealed details of doping in T-Mobile, said doping was also widely practised at Quick Step, formerly known as Mapei, where he raced between 2001 and 2005.

After his T-Mobile sacking, Sinkewitz spent five-hours giving evidence to the German Cycling Federation's (BDR) disciplinary committee in October and revealed the extent of doping at the German team up until 2006.

His confession meant the expected two-year ban was reduced to a single year.

"Doping started to interest me in 2000, I heard about erythropoietin (EPO) through the media and heard it was widespread," Sinkewitz told German daily the Sueddeutsche Zeitung.

"I got information from several people including the trainer of the Germany team Peter Weibel."

"He did not advise me to resort to EPO, but at the same time he didn't tell me not to do it."