Other excerpts from Keane's book the second half

"There'd been a little bit of tension between us over the years,

for football reasons. He said, 'I've had enough of you. It's time we sorted this out.' So I said, 'OK,' and we had a fight. It felt like 10 minutes. There was a lot of noise - Peter's a big lad. I woke up the next morning. I kind of vaguely remembered the fight. My hand was really sore and one of my fingers was bent backwards. Anyway, Peter had grabbed me, I'd head-butted him - we'd been fighting for ages."

- On the fight with Peter Schmeichel during a pre-season tour of Hong Kong in 1998

"Now I kind of wish I hadn't (apologised). Afterwards I was thinking, 'I'm not sure why I f****** apologised.' I just wanted to do the right thing."

- On his apology to Alex Ferguson for the MUTV interview in 2005 in which he criticised his teammates and led to his acrimonious departure after 12 years at Old Trafford

"I should have appreciated Real's offer more. It was the most attractive challenge in front of me but I didn't accept it. In hindsight, I should have said to myself: 'Go, go to Spain, live there for a year and a half, learn the language, learn the culture.' I took a negative approach. As much as anything else, it was fear that decided me - fear of the unknown."

- On the chance of playing for Real Madrid after leaving Man United in 2005

"There are things I regret in my life and he's not one of them,"

- On the horror tackle on Man City player Alf-Inge Haaland

@Egilostenstad cant take a man seriously when hes got a beard like.... (alongside an image of a captured Saddam Hussein)."

- Haaland tweeted when asked for a comment by friend Egil Ostenstad. He later deleted the post