Just how do you replace the irreplaceable?
Real Madrid coach Jose Mourinho, Borussia Dortmund coach Juergen Klopp and Ole Gunnar Solskjaer, a former United striker who has made an impressive start to his managerial at Norwegian side Molde, are also viewed as contenders.
"What we are looking for is not someone to come in 10 months or three years, we want someone to come stay there and give stability," former United goalkeeper Peter Schmeichel said Wednesday. "When we talk about Moyes, he has been a decade at Everton and done a fantastic job on limited funds."
United has always appeared a natural fit. And he would have the blessing of Ferguson, who said Wednesday he will remain involved in the club as a director and ambassador and is sure to have a say in who succeeds him.
"Pep Guardiola, Jose Mourinho, David Moyes ... there's a lot of successful managers out there," Ferguson said at the start of this year, answering a question about a worthy successor.
Being mentioned in same sentence as Guardiola and Mourinho can't help but boost Moyes' belief. United has never had a foreign coach, either.
Mourinho has been heavily linked with a return to Chelsea this summer, but the United job is clearly one he would relish. He has the gravitas and experience to step into Old Trafford and take over from the man he dubs "The Boss."
At the recent Champions League last-16 match between Madrid and United, Mourinho went out of his way to say all the right things in pre-and post-match news conferences, even saying the "best team lost" after Madrid sneaked through on aggregate after struggling in the second leg.
Mourinho knows the Premier League well from his three seasons at Chelsea from 2004-07. But he has yet to build an empire at any of his clubs — three years is the most he has spent at one team — and that may be looked down upon in United circles.
With Guardiola already committed to joining Bayern from next season, the candidates to replace Ferguson are few and far between.
Rafa Benitez's short-term contract is up at Chelsea at the end of the month but it would be hard to see him at Old Trafford after his run-ins with Ferguson during his time at Chelsea.
Klopp is highly rated and regularly linked with a move to the Premier League, but it may be too soon for him.
Copyright 2013 The Associated Press.