GENEVA, Dec. 18 (Xinhua) -- Cycling's world governing body (UCI) said on Wednesday that Olympic bronze medalist and three-time world time trial champion Michael Rogers of Australia has tested positive for clenbuterol.

Rogers tested positive for clenbuterol, which helps build muscle and burn fat, at the Japan Cup on Oct. 20.

Rogers denied he knowingly took the substance.

Rogers joined Saxo-Tinkoff last season, riding with Alberto Contador who tested positive for clenbuterol at the 2010 Tour de France.