But before he’d even pulled on the red of United, Keane enraged one of the club’s most popular former players: Kenny Dalglish.
Dalglish was the manager of Blackburn in the summer of 1993, when Keane was looking to leave Nottingham Forest for pastures new.
Blackburn courted Keane, and the former Republic of Ireland man had ‘shook hands’ over a transfer.
But Keane’s head was turned when United and Sir Alex Ferguson came calling. With a £400,000-a-year offer on the table from Blackburn, Ferguson and then-assistant Brian Kidd came in with an offer of their own.
And although the £300,000 per year was far lower than Blackburn’s proposed contract, Keane decided he’d be better moving to Old Trafford.
But before the deal was complete, Keane claims Dalglish got wind of the midfielder’s plan to snub Blackburn.
“He was effing and blinding (on the phone), saying ‘you’re a f**king disgrace,” Keane said.
“I said, ‘listen, I’m going on me holidays next week’, which I was, I was going to Cyprus with a few lads… just to do some sight seeing.
“‘I’m going to Cyprus with my mates, and when I come back I’m going to sign for Man United’.
“He said: ‘I’m going to find you. I’m going to come to Ayia Napa and find you. So, every bar in Ayia Napa, I was looking over my shoulder waiting for Kenny Dalglish to walk in.”
Sounds like a terrifying holiday to be on. But it’s hard to say Keane made the wrong decision in the end.