Luis Suarez's fourth month ban from all football for biting has been upheld after his unsuccessful appeal to the Court of Arbitration for Sport, but the Uruguay international is free to return to training.

Suarez, 26, was handed the heavy sanction after biting defender Giorgio Chiellini during a World Cup group stage clash between Uruguay and Italy in June.

Last month Fifa rejected his initial appeal, prompting the player and the Uruguayan FA to take their case to CAS.

Suarez, who completed his move to Barcelona in a deal reportedly worth £75m in the aftermath of the incident that shook the World Cup, was also handed a nine-match international ban for the incident and a 100,000 Swiss franc (£66,000) fine by Fifa.

It was the striker's third biting controversy in a career that is becoming increasingly associated with controversy and the sublime in equal measure.

Suarez was infamously banned for 10 games after biting Chelsea's Branislav Ivanovic during a Premier League game in April 2013.

That followed a seven match ban he received in Holland in 2010 while playing for Ajax when he was caught on camera biting PSV Eindhoven midfielder Ottman Bakkal.