Stepping into Sir Alex Ferguson's sizable shoes was always going to be tough, but since his retirement in 2013 following a 27-year tenure that brought 13 titles and two Champions Leagues, Manchester United have been on a downward spiral.
The hope was that Everton boss David Moyes would be the ideal candidate to take on his fellow Scot's legacy and put his own trophy-laden stamp on Old Trafford. But having signed a six-year contract to join in June 2013, Moyes was sacked in late April 2014, with United mathematically unable to qualify for the following season's Champions League.