Yet another layer has been added to the complex relationship and subsequent fall-out between Roy Keane and Sir Alex Ferguson after the midfielder admitted he used to lie to his old boss about his drinking habits.
The duo spent more than 12 years together at United, much of which was littered with success including seven Premier League titles, four FA Cups and one Champions League, but they no longer see eye-to-eye after Keane left the club under acrimonious conditions.
While Keane was often portrayed as a stern, serious tough-tackling character who took no prisoners, he has spoken about how he would unwind from the stress of his role as Manchester United captain with some heavy drinking and partying occasionally.
Given United's hectic playing schedule often meant they would play a mid-week European game, most commonly on a Wednesday night, before a Saturday afternoon league fixture.
As a result, Keane and some of his teammates would use the Wednesday or Saturday night as the perfect time to unwind with some late-night boozing.
While talking to former teammate Gary Neville on Sky Bet's show The Overlap, Keane confessed he would often downplay just how much he had actually drunk to his manager and how that, along with the guilt that followed, would motivate him to ensure United won all that they could.
"Alex Ferguson pulled me many times going 'you were out in Manchester and got a taxi at 2.30am' and I would go 'yeah, I did but it's not breaking the 48-hour rule in our contracts'," the Irishman said.
"I'd use to argue with him and then he'd ask 'how many drinks did you have?' and then I'd lie to him. I would say to him 'maybe 10 or 11 bottles' and he'd reply '10 or 11 bottles!?'. If only I told him the truth as that was every hour!
"You told the odd white lie as you're going along obviously, but you're having a laugh and getting away with it. I wouldn't change any of it. I'd always be in on a Thursday morning [the morning after a night out] because of the guilt for going out.
"So on a Saturday I'd be thinking "we'd better win because we're out on Saturday and if the manager finds out we're in trouble". We had to win matches and trophies to justify the life we were living."
Keane arrived at United in 1993, where the drinking culture was drastically different to what it currently is at Old Trafford, something that he felt allowed him to drink until the early hours.
Who was to blame for Keane's fall-out with Sir Alex Ferguson? Have your say here.
"I fell out with the manager a few times over it. Some took up golf or snooker but mine was going out and enjoying myself. If someone said to me do you want to go out after a game on a Wednesday then we'd all go into Manchester, go into Chinatown and having a Chinese until about four or five in the morning.
"If someone said to me after a game are you going go for a bite to eat to refuel for Saturday I would say "no I'm going into town". I'll be thinking they're the lunatics, not me!
"I thought I had to go out and drink as much alcohol as I possibly could, then Thursday morning I'd turn it around and think I best get ready for Saturday. And that was the life."
