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Patrick Sinkewitz tested positive for testosterone in an out-of-competition test prior to the 2007 Tour de France. ((Michael Probst/Associated Press))

German cyclist Patrick Sinkewitz has confirmed that his B sample tested positive for the human growth hormone.

Sinkewitz tells German newspaper Sueddeutsche Zeitung that "unfortunately it's true and I know that no one believes me." Sinkewitz has denied doping but he faces a lifetime ban for his second offence. He is the first cyclist to test positive for HGH.

The German tested positive for testosterone in an out-of-competition test before the 2007 Tour de France.

He was banned for one year, half the usual suspension because he co-operated with German investigators and shared details about doping in cycling.