MELBOURNE (Reuters) - Australia's Olympic road cycling medal hopes have suffered a blow with world silver medalist Simon Gerrans forced out of the Rio de Janeiro Games after breaking a collarbone at the Tour de France.

The 36-year-old Orica-BikeExchange rider underwent surgery in Barcelona over the weekend after being ruled out of the Tour following a crash.

He was set to be replaced by another rider in the Australian team at Rio, a Cycling Australia spokeswoman confirmed on Sunday.

Two-time Olympian Gerrans had been selected in the road race at Rio with BMC Racing rider Rohan Dennis and Richie Porte, a twice world champion in the team time trial.

(Reporting by Ian Ransom; Editing by Sudipto Ganguly)