Rangers legend Ally McCoist has joked that Sir Alex Ferguson's decision not to sign him is proof even the greatest managers make mistakes.The Ibrox hero was a youth player at St Mirren and Fergie used to give him a lift to training while he was manager at the Paisley club.Ferguson left St Mirren in 1978 and McCoist started his career at St Johnstone but he then had a successful career at Rangers after a spell at Sunderland.He spent 15 years at Ibrox as a player before ending his career at Kilmarnock but despite his fine goalscoring record and his history with Ferguson, the Manchester United great never made a move to take him to Old Trafford.Get all the latest Rangers news sent straight to your Inbox every day by signing up to our
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