Former Manchester United midfielder Roy Keane has hit back at accusations in Sir Alex Ferguson's new book by suggesting his former manager lacks loyalty.
Speaking on ITV, he said: "He don't think he knows the meaning of the word.
"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 very strange.
"But I certainly won't be losing sleep over it."
He added: "I don't think the manager needs to do it. I'm not sure how many books he's written now, but he has to draw the line eventually. Can you imagine if we never won a trophy what he would have said?"
"It's part of modern life... people like to do books and criticise their ex players", he added.
Former Manchester United manager Sir Alex Ferguson launched his autobiography today, which lifts the lid on his relationship with the club and some of its famous players.
He told ITV News' Mark Austin that the cult of celebrity prevented David Beckham from becoming a footballing legend.
He also spoke about influence of massive player salaries on the game and said "somewhere along the line, the game will get a rude awakening".
On his successor, David Moyes, Sir Alex said that the "hard-working" manager "would be given time" to get things right at United.
Sir Alex Ferguson told ITV News England should be aiming for the quarter-finals in the World Cup and ruled out ever managing the Three Lions.
He told ITV News presenter Mark Austin: "It's not an easy trophy to win. England have won it once on home soil - but usually it's been shared by Italy, Germany and Brazil. Historically it's very difficult.
"But remember, for Scotland to get to the Championship finals is a success. For England, I would think...getting to the quarter-finals would be great...then you want to think about semi-finals etc."
Asked whether he could one day manage the Three Lions, Sir Alex said: "Absolutely no chance of a Scot managing England, trust me - I couldn't go back."
Sir Alex Ferguson told ITV News David Beckham could have been a Manchester United legend but changed after his marriage to Victoria.
He told ITV News presenter Mark Austin: "My take on it is that he could have been in the same position as Giggs and Scholes, twenty years at United, he would have been an absolute legend, in the pantheon of all the great legends we've had."
"Me being a football man, I want to see them totally committed to the team - that waned and went down a bit."
However, the former Manchester United boss did admit that Beckham had become an "icon" and "inspiration for young people" and praised the midfielder for how he "reinvented" himself later in his career.
Sir Alex Ferguson tells Mike Hall that he may not have retired if Manchester United had failed to win the Premier League last season.
Sir Alex Ferguson tells Mike Hall he discouraged David Moyes from signing a new Everton contract, when he knew his time at Manchester United was coming to an end.
Sir Alex Ferguson's autobiography lifts the lid on his relationship with David Beckham, Wayne Rooney, Cristiano Ronaldo and Arsene Wenger.Read the full story ›
The football world is bracing itself for some typically brutal observations when Sir Alex Ferguson's biography is released this morning.
Football fans will be keen to see what the legendary former manager has to say about Wayne Rooney, who would surely have been shown the exit door if Ferguson had not retired last summer.
As it is Ferguson will need to tiptoe round the matter carefully so as not to cause new Manchester United manager David Moyes any problems.
Ghostwriter Paul Hayward says Ferguson "recalls the great players he has managed", listing Roy Keane, Cristiano Ronaldo and David Beckham, and "shares his thoughts on Arsene Wenger, Jose Mourinho and Rafa Benitez".
Sir Alex Ferguson told Manchester United TV in a recent interview: "The problem with doing a book is you have to bring in the elements and factors which in many ways either affected or determined your management decision-making.
"Because I've been at the club such a long time and you're building team after team after team, there are areas that you can't ignore.
"Why we sold certain players like David Beckham and Ruud van Nistelrooy. You can't ignore these things because these guys were big, big figures in Manchester United's career history."
Sir Alex Ferguson's eagerly awaited account of his life as Manchester United manager will be released later today.
Ferguson, who has been keen to keep the contents of the book a secret, will enlighten his audience about the most decorated career the game has ever known.
There have been no official leaks and no serialisation ahead of five sell-out Q+A evenings, that start in Manchester next Monday and take in visits to London, his home city of Glasgow, Aberdeen, where he first made an impact, and Dublin.