Without Roy Keane, Sir Alex Ferguson may not have won as many trophies as he did during his remarkable 26-year spell as Manchester United manager.
Keane, United’s talismanic captain, ensured that standards never slipped during matches or even on the training pitch.
He came down like a ton of bricks on anyone he felt was slacking. No player wanted to get on the wrong side of Keane as much as they didn’t want to face Fergie’s wrath.
Perhaps nobody should have been surprised by the abrupt way Keane’s spell at Old Trafford ended.
He clashed with Ferguson and that was that. On November 18 2005, United fans - and indeed, the wider football community - were left shell-shocked when it was announced that Keane had left United by mutual consent.
Sadly, their relationship never recovered.
And things were made worse in 2013 when Ferguson released his infamous autobiography.
The legendary Scot said Keane had become an increasingly negative influence in the dressing room and added: “The hardest part of Roy's body is his tongue. He has the most savage tongue you can imagine.
"He can debilitate the most confident person in the world in seconds. He was an intimidating, ferocious individual."
Per The Guardian, he added: ”What I noticed about him that day as I was arguing with him was that his eyes started to narrow, almost to wee black beads. It was frightening to watch. And I'm from Glasgow."
Ferguson also said that Keane was starting to think he was the manager.
"The one thing I will not allow is a loss of control,” Ferguson said, “because control was my only saviour.”
Shortly after these quotes first emerged, Keane appeared as a pundit on ITV Sport to cover a Champions League clash between Arsenal and Borussia Dortmund.
And Keane, well, went full Roy Keane.
"I remember having conversations about loyalty when I was at the club. I don't think he knows the meaning of the word,” Keane responded.
“It doesn’t bother me too much what he has to say about me but to constantly criticise other players that brought him a lot of success, I find very strange. I certainly won't be losing any sleep over it."
ITV presenter Adrian Chiles then suggested that Ferguson was out of order for criticising David Beckham, to which Keane added: “I just don’t think he needs to do it. I’m not sure how many books he’s written now but he has to draw the line eventually and say ‘these players have all been top servants to Man United’.
“Can you imagine what he would have said if we’d never helped him win a trophy?
“We brought success to the club, we gave it everything we had when we were there.
“It’s just part of modern life now. People like to do books and criticise their ex-players.”
Ian Wright found Keane’s reaction particularly amusing. The former Arsenal striker burst out laughing live on air.
Wright said: “It’s just the way Roy’s dealing with it!”
Lee Dixon, meanwhile, then added: “I agree with Roy, I don’t understand books at all.”
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