Ferguson is now 70 and has been in the manager's seat at Old Trafford since 1986 and his success story is legendary.
12 Premier League titles, two Champions Leagues and five FA Cups are the biggest of his many successes, but for some time there has been speculation that he may leave it all behind at the end of this season.
Anderson says United will have all sorts of problems when Fergie has gone, he told the Daily Star: “Manchester United is Alex Ferguson. When he leaves, the club will lose 30 to 40 per cent. So much depends on him.
“He’s a father to all the players, a very respected person and when he retires, the football world will really feel his loss.
“He always helped me, and I have a great affection for him. He lives for training and always wants to know how his players and their families are.”