It's the question that strikes fear into the heart of Manchester United fans like myself. One of the most intriguing long-term debates in European football. 

Who will replace Alex Ferguson at Manchester United? 

The question has been in circulation since the Scot was on the brink of calling it a day back in 2002. There have been many names thrown into the hat, but who is the right man for the job? Let's take a look at three of the candidates: 

1 - David Moyes: 
Since joining Everton from Preston North End in 2002, Moyes has undoubtedly done a fantastic job. The first man to break up ' The Big Four ', Moyes has taken the Toffees from strength to strength over the last decade, working on a shoe string budget. Considering his achievements with average funds and, no disrespect to the likes of Tony Hibbert, average players, one can only wonder what Moyes would accomplish at a club with the financial resources and young, talented players of Man United. 

2 - Pep Guardiola: 
Also on the managerial short-list for the Red Devils is former Barcelona gaffer Pep Guardiola. After his incredible achievements with the Catalan giants (He won his first Champions League at 37, the youngest to ever do so), he is currently unemployed, leaving the club after his first trophy-less season in his 4 year stint. Many see the 41 year old as the ideal candidate; young, gifted and has a burning desire to win. The now iconic 'Tika-Taka' football of Barcelona would be replicated at United, which, alongside silverware, would be welcomed with open arms. 

3 - Jose Mourinho: 
Considered by many as the greatest in the world, 'The Special One' has an astounding reputation and, one way or another, he wins trophies where ever he goes. Currently plying his trade at Real Madrid, Mourinho started his managerial career at Porto, where he sensationally won the Champions League in 2004. After successful stints at Chelsea and Inter Milan, Los Blancos came knocking and off Mourinho went, where, unsurprisingly, he is equalling the success of his previous clubs. He and Sir Alex share a huge mutual respect for each other, and he will certainly be in the frame for the Glaswegian's position when it eventually becomes available.