Sky Sports pundits Jamie Carragher and Gary Neville were both in agreement over the “unbelievable” individual who had a major impact on Manchester United legend Sir Alex Ferguson. Former Manchester United boss Sir Alex Ferguson is widely regarded as one of the best managers of all time after his impact in both Scotland and England. The 82-year-old Scotsman arrived at Old Trafford in 1986 and replaced Ron Atkinson as United manager, with Ferguson initially enduring a tough start at the club. However, Ferguson weathered the storm at the Red Devils and the legendary Scot went on to have a lost-la…