The book is not on the shelves until Thursday, but already the revelations from within are causing shockwaves in the world of football.
Ferguson takes aim at fiery Keane over his unharmonious exit from the club in 2005, while the conduct of David Beckham, Wayne Rooney, Ruud van Nistelrooy, Jaap Stam and Juan Sebastian Veron, among others, is also discussed.
Keane gets the most criticism in the book. He says he "will not lose sleep" over Ferguson's claims regarding him, but he is upset by the way the Scot has spoken openly about other United players who brought him so much success during his 27-year reign at Old Trafford.
"I do remember having conversations with the manager when I was at the club about loyalty and, in my opinion, I don't think he knows the meaning of the word," Keane told ITV1.
"It doesn't bother me too much what he has to say about me but to constantly criticise other players at the club who brought him a lot of success, I find very strange.
"But I won't be losing any sleep over it."
He added: "I just don't think the manager needs to do it.
"I don't know how many books he's written now but he has to draw the line eventually to say 'listen these players have been all top servants to Man Utd'.
"And a lot of these players helped the manager win lots of trophies so imagine if we'd never won a trophy what he would have said.
"We brought success to the club, we gave it everything we had when we were there.
"But, as I said, it's just part of modern life now, people like to do books and criticise their ex-players."
Ferguson lifted the lid on his feud with Keane in the book, claiming he had no option but to offload the increasingly volatile player in 2005.
Ferguson reveals that Keane "slaughtered" several of his team-mates in an interview for United's in-house channel MUTV and then rowed with the squad after they heard his comments.
Keane then accused Ferguson of brining his own dispute with shareholder John Magnier over the Rock of Gibraltar racehorse in to the club.
That proved to be the last straw for the fiery midfielder.
"Given the nature of the man you can expect a response. That is the type of personality Roy is," the former United boss told a press conference.
"We had to react to the situation so quickly because his actions were so quick. For one reason or another he decides to go and criticise his team mates.
"Most of you won't have seen the video but you couldn't release it. You just couldn't.
"It ended up with two of our young players being booed before a Champions League match in Paris because of it.
"We decided we had to do something. The meeting in the room was horrendous. I just couldn't lose my control in this situation.
"If I had let it pass and allowed it to happen the players would have viewed me differently. Much more differently to how I would have liked to have been judged.
"Throughout my career I have been strong enough to deal with important issues like that. Roy overstepped his mark. There was no other thing we could do."