Sir Alex Ferguson has waxed lyrical about the phenomenal impact of one former Manchester United star during his legendary reign at Old Trafford. The 82-year-old Manchester United legend left the Red Devils in 2013 after he secured the Premier League club’s last league title in the 2012-13 season. Sir Alex Ferguson created an enduring legacy at the Red Devils, with the revered Scotsman considered one of the best managers of all time. The legendary former United manager first arrived at Old Trafford in 1986 after he left Aberdeen and succeeded Ron Atkinson at the Premier League club. Ferguson we…