Career
Sibley was the youngest player to play in the QPR first team at the age of 15 on 3 September 1963 away to Aldershot in a League Cup tie. He retired from playing early, at the age of 23, after suffering a knee injury. He joined the coaching staff at QPR, and later became manager.
He was also manager of Walsall in 1979.
He is currently chief scout for Watford.