2.31pm BST

Here's Dave Hytner dissecting the chapter on Roy Keane...

"Ferguson paints the picture of Roy Keane, his former captain and talisman, as an erratic and terrifying figure, capable of frightening even him and, certainly, many players inside the dressing-room. Keane ruled with an iron fist and a savage tongue, which Ferguson said was the hardest part of his body. Their fall-out has become part of Old Trafford folklore and Ferguson traces the context to the decline in Keane’s on-field powers, and the related frustration he felt with that.

Keane had been furious about what he felt had been substandard pre-season facilities at Vale de Lobo, Portugal, in 2005 but it all kicked off when he gave his notorious interview to MUTV, in which he slaughtered many of his teammates including, according to Ferguson, Kieran Richardson, Darren Fletcher, Alan Smith, Edwin Van Der Sar and Rio Ferdinand. Of Ferdinand, Keane is said to have been scornful of the defender’s belief that he was a superstar ... “just because you are paid £120,000-a-week and play well for 20 minutes against Tottenham.”

Keane suggested that the squad watched the interview in order for them to make up their own minds and what followed was a ferocious confrontation between him and many of them, together with Ferguson. In front of the squad, Keane slated Ferguson for bringing his personal affairs to United, in the form of his dispute with John Magnier over the racehorse, Rock of Gibraltar. Ferguson said that it had been “frightening” to watch. He had to act and he immediately sanctioned the paying up of Keane’s contract and his departure to Celtic.

Ferguson writes that Keane did pop in to see him to apologise but the relationship has since turned ugly again after public comments between the pair. Ferguson also passes judgement on Keane’s managerial career, saying that he needed money to build squads and lacked the requisite patience to do so."