Jamaica's Usain Bolt has lost one of his nine Olympic gold medals and his perfect triple triple of Games' sprint victories after teammate Nesta Carter was found guilty of doping at the 2008 Beijing Olympics.

Carter was found in re-tests of his sample to have taken the banned stimulant methylhexaneamine, the International Olympic Committee (IOC) said on Wednesday, meaning Jamaica's 4x100 metres relay team must give back their gold medals.

Carter's lawyer, Stuart Stimpson, said the sprinter would lodge an appeal with the Court of Arbitration for Sport (CAS).

"Mr Carter will be taking his appeal to CAS," Stimpson said.