Hamburg - German cyclists Andreas Kloeden and Matthias Kessler have been implicated in illegal doping practices following an independent investigation, news magazine Der Spiegel reports. The former T-Mobile cyclists are suspected of having received banned blood transfusions by doctors at Freiburg University Clinic, the magazine reports in its edition to appear Monday, quoting the results of an investigation by an expert commission.

The independent commission has spent two years looking into doping allegations against the doctors, Lothar Heinrich and Andreas Schmid, who are alleged to have created a systematic doping system between 1995 and 2006 for the former T-Mobile and Team Telekom team.

Kloeden, who now rides for Astana and is regarded as Germany's top cyclist, and Kessler, who is serving a doping ban, did not comment to Spiegel on the report. Kloeden has always denied doping.

Former T-Mobile rider Patrik Sinkewitz has admitted having received banned blood transfusions from the Freiburg doctors and also to having used the illegal blood-booster erythropoietin (EPO).(dpa)