Sky Sports pundit Jamie Carragher has spoken highly of the impact that one Manchester United legend had under Sir Alex Ferguson at Old Trafford. Sir Alex Ferguson is one of the best managers of all time and had a long-lasting impact on English – and world – football during his time at Manchester United. The legendary former United manager left Aberdeen in 1986 after a trophy-laden spell in Scotland and replaced Ron Atkinson at Old Trafford. Ferguson overcame a tough start to life at the Red Devils before ushering in a period of dominance for United in the top-flight domestic league in England….