In his latest book Ferguson has once again given the press something to debate about, as he wrote in his book that he has managed just Four world class players.
The four players which include, French man Eric Cantona, Real Madrid star Cristiano Ronaldo, English man Paul Scholes and the ever green Ryan Giggs.
Sir Alex Ferguson says he worked with just four world-class players at Manchester United -- and Wayne Rooney, Roy Keane and David Beckham or even Neville brothers were not among them.
The Scot nominated Eric Cantona, Cristiano Ronaldo, Ryan Giggs and Paul Scholes as the quartet who were at the very highest level, as he also omitted Ruud van Nistelrooy, Peter Schmeichel, Rio Ferdinand and Carlos Tevez from his select list.
Ferguson preferred Cantona, the catalyst when United won the league title for the first time in 26 years in 1993, and Ronaldo, who scored 42 goals in their Champions League-winning campaign in 2008.
Giggs became the most decorated player in the history of English club football under Ferguson, winning 13 Premier League titles and two Champions Leagues, and making 941 of his record 963 appearances during the Scot's time in charge.
Fellow one-club man Scholes played 718 times under Ferguson, who told the BBC's Football Focus: "They made the difference and the evidence is there. When we brought him [Cantona] in we won the league that season -- it was his mere presence and his ability to make and score goals.
"The younger breed like Ryan and Scholes were just fantastic players and the thing about those two was longevity. Are there players who have played right through the whole of the Premier League and performed at the level they have? There are none, absolutely none.
About the Portuguese Sir Alex said "Of course, Ronaldo was just a complete genius of a player."
Ferguson said he managed other "great" footballers but explained: "These players elevated themselves above that."
Many may like to argue about the Scot's choice but following what have been happening at Man Utd since his retirement one will have little to argue because it seems that he is only one that truly understands the club and whatever he says is correct.