Following in the footsteps of Sir Alex Ferguson as Manchester United was always going to be tough for any manager.
With 38 honours over 27 hugely successful years, the Scotsman will forever be etched in history as one of the most era-defining coaches.
That task in replacing him fell to David Moyes - who was recommended by Ferguson - after he had impressed during 11 years at Everton as the Toffees pushed themselves towards the upper echelons of the Premier League.
However, it failed to work out with Moyes dismissed after just 10 months at Old Trafford, having lost 15 of his 51 games at the club.