An injury forced runner Maria Alejandra Idrobo to drop out of the Colombian squad taking part in the London Olympics, the vice president of the Andean nation's Olympic committee said Tuesday.

"She had an injury in the Grand Prix of Cali last month and, according to the doctors, she was going to recover, but in the end the medical staff ... said she was not going to be fit for the games," Ciro Solano told Colombia's RCN Antena 2 radio from London.

The withdrawal of Idrobo - the only athlete to drop out so far - reduces the Colombian Olympic squad to 103 competitors.

Idrobo, one of the four runners chosen to represent Colombia in the 4x100 meter relay in the London Olympics, has been competing at the international level since 2003. EFE