Davide Rebellin and Stefan Schumacher have appealed to sport's highest court to overturn their disqualifications from the Beijing Olympics for doping.

The Court of Arbitration for Sport says both riders have asked it to annul the International Olympic Committee's decisions last month. CAS has not set dates for hearings.

The IOC said it stripped Italian rider Rebellin of his road race silver medal because he tested positive for the blood-booster CERA.

Using a new test, the IOC said Germany's Schumacher also had traces of the drug in a blood sample analyzed months after the games.

Schumacher is also challenging a two-year ban from the International Cycling Union after he tested positive for CERA at the 2008 Tour de France.