That'd surely be up to the medical staff (who are no longer at the club) and the player. Remember listening to someone like Roy Keane say that players will often play through the pain if they feel that they can (see Dunk, and Greer further in the past) but I think it would be negligent from the employer to force a player to play through an injury if they weren't cleared by the medical team.Purely speculative but maybe Ferguson told RDZ he had pains in his foot but was told to carry on playing? No knowledge, just guessing.