Manchester United's press office has tweeted a picture of the final matchday programme of Sir Alex Ferguson's reign.
The front of the programme says "thank you Sir Alex."
Manchester United players have been seen at Chester Racecourse on the day the club announced that Sir Alex Ferguson would be retiring at the end of the season.
Amateur footage shows the Manchester United squad, including Ryan Giggs, Rio Ferdinand, Michael Carrick and Danny Welbeck, for the first time since the announcement.
Former Manchester United captain Bryan Robson said Sir Alex Ferguson's greatest achievement was his first league title in the 1992/1993 season - surpassing the club's treble in 1999.
Robson added that Sir Alex's success as a manager was down to his "determination" and "judgement on players."
Former Manchester United striker and club legend Denis Law said he was really surprised to hear Alex Ferguson has decided to retire, adding that he thought Fergie would manage until he was 90.
He said: "I said a couple of weeks ago that when Sir Alex eventually retires at 90 he will probably go down as the greatest manager of all time. This morning I hear the news, and I was really surprised. I had no idea that he was going to do that."
Manchester United PLC shares on the New York Stock Exchange fell 4% in the first fifteen minutes after opening following the news that Sir Alex Ferguson is to retire.
Starting the day with a market capitalisation of £1.997bn, the 4.05% fall equates to a loss of over £80m in value - the same figure the club received when it sold Cristiano Ronaldo to Real Madrid in 2009.
Real Madrid star Cristiano Ronaldo, who played for six seasons under Ferguson at Manchester United, tweeted his appreciation for the manager who made him a star.
Thanks for everything, Boss. http://t.co/WfU1h2Prhb
He attached a picture of the pair when he signed in 2003.
Ronaldo joined Madrid in 2009 for a world record fee of around £80m.
Manchester United chief executive David Gill told the club's TV channel MUTV that Sir Alex Ferguson would have a role in appointing a new manager.
"No one knows what running Manchester United is about better than him, so quite rightly the owners, the board, will take his counsel," he said.
"We want to use all the expertise within the club in order to get the right person to take it forward."
He added that Ferguson would be staying on in an advisory role as a director but that a new manager would be allowed "the necessary space, the necessary opportunity to do his job without interference.
"Alex will not make that mistake, of that we can be certain."
I understand Everton players are resigned to David Moyes leaving the club.
He took training amid a "strange atmosphere" this morning.
Former United defender Steve Bruce believes any successor to Ferguson will struggle to get close to emulating his record.
Hull manager Bruce said Everton boss David Moyes, the early favourite to replace Ferguson, had done well enough at Goodison Park to be able to take on the United job.
"He's cut out of the same cloth (as Ferguson) so it wouldn't surprise me," Bruce told Sky Sports News.
"Whether it's Jose [Mourinho] or David Moyes or whoever it is, it's going to be some act to follow.
"It doesn't seem quite right that Fergie won't be in charge of Manchester United any more. It's impossible to copy somebody like him.