With the former United manager no stranger to banning journalists who have asked him questions he didn't want to answer from press conferences, here are six questions the fans would love to know the answers to but no one has been brave enough to ask.
Whilst Manchester United fans at West Brom were singing songs of support for David Moyes on Saturday, plenty of Reds would be happy to see Ferguson replace David Moyes as manager for the remaining few months of the season to ensure that the club finishes in the top six to secure Europa League football next season.
It is unlikely. Ferguson was able to retire on a high, winning that record-breaking 20th title for United, and wouldn't want to taint his legacy with the failure this season will be remembered for.
Would anything tempt him out of retirement now?
In May 2010, Portuguese winger Bebe was offered to Dutch side PSV on a free transfer, as reported by the BBC. PSV rejected the offer as they had never heard of him.
Three months later, United paid £7.4 million to sign Bebe, but he only went on to make two appearances in the league.
Ferguson admitted that he hadn't even seen Bebe play before agreeing the transfer, according to The Daily Mail's David Kent.
I didn't see any videos of him, it's the first time. Normally, as in the case of Javier (Hernandez) and Chris (Smalling), I saw plenty of video footage of them. You've got to trust your staff at times and our scout in Portugal was adamant we must do something quickly. So were one or two other clubs and that's where you have to make quick decisions in life and I'm not too bad about that.
Two years after he was signed, The Guardian reported that police were investigating the transfer after the player's agent, Jorge Mendes, received close to £3 million in the deal, although this came to nothing.
Bebe is still on the club's books but hasn't played for United in three years, begging the question, why did Ferguson sign him in the first place?
Paul Pogba was supposed to be the next big thing at United after joining the club as a teenager. With his contract set to expire at the end of the 2011-2012 season, meaning he could leave on a fee, United fans were waiting to see this talented youngster in action.
However, for whatever reason, Ferguson seemed reluctant to give him a go and even resorted to playing Rafael da Silva and Park Ji-Sung in the centre of midfield for United's home defeat against Blackburn. Just a draw in this game would have been enough to see United pip City to the title by one point.
It was a very, very difficult moment for me because I was in love with Manchester and I was a Mancunian. It was the match against Blackburn in December 2011 at Old Trafford. Paul Scholes had retired, Darren Fletcher was injured. There was no one left to play in midfield. And I was training and I was beginning to get better bit by bit and the coach never stopped telling me, 'You're this far'. And I didn't understand. This far away from what? Playing? From having some playing time? From getting on the field? Or what? And there was Rafael in midfield and I was disgusted. I was disgusted and I didn't get on either. I'd lost that thing, that relation that I had with the coach. I was really disappointed, really disappointed. I was pushed. My eyes were opened. I'd made this decision to sign with Juventus. There was nothing to regret.
Pogba has gone on to play a huge part of Juventus' title-winning team and last year was named the best young talent in Europe, scooping the Golden Boy award.
Why didn't Ferguson give Pogba a go in the first team in a bid to keep him at United?
The last midfielder Ferguson purchased for United was Owen Hargreaves in the summer of 2007. Five years went by without the manager feeling the need to strengthen what was an obvious weakness in the team and then he retired.
Whilst United were linked to a whole host of world-class midfielders during that time period, Ferguson never dipped into the transfer market.
There are plenty of reasons for United's fall from grace this season, but Moyes' job would have been made a lot easier if he had a good midfield to work with.
Why didn't Ferguson address the midfield problem?
Manchester United were in the relegation zone when Ferguson got the job in 1986, yet the club required a manager with league titles as well as domestic and European trophies on his CV to replace Ron Atkinson.
It is strange, then, with United having transformed as a club since 1986, from one fighting a relegation battle to one striving to win the title and Champions League every season, that the club employed a manager without a single trophy to his name.
Ferguson spoke to ManUtd.com about the reasons behind Moyes being chosen for the job.
When we discussed the candidates that we felt had the right attributes we unanimously agreed on David Moyes. David is a man of great integrity with a strong work ethic. I've admired his work for a long time and approached him as far back as 1998 to discuss the position of Assistant Manager here. He was a young man then at the start of his career and has since gone on to do a magnificent job at Everton. There is no question he has all the qualities we expect of a manager at this Club.
In a summer when the likes of Pep Guardiola and Jose Mourinho started work at their new clubs, why did Ferguson give his backing to Moyes and not to one of Europe's best managers?
In 2003, Sir Alex Ferguson decided to sue John Magnier over the ownership of the racehorse The Rock of Gibraltar. The dispute ended with Ferguson receiving £2.5 million, according to Sam Wallace of The Telegraph.
Magnier owned 29 percent of the club, and following this feud, he opted to sell United to the Glazer family, who plunged the club into debt.
In his recent autobiography, Ferguson didn't mention anything about the incident, which Paul Handler from the Manchester Evening News later reported on.
It was straightforward. I had an agreement with John Magnier, that after the settlement nothing will be said about it at all. I’ve said nothing and they’ve said nothing. That’s how it is and that’s how it should be.
Knowing that suing Magnier would likely result in the football club being sold, why couldn't Ferguson put United ahead of his personal monetary gain?