It's no secret that Roy Keane and Peter Schmeichel weren't exactly the best of friends during their time together at Manchester United.
The pair were two of the core members of Alex Ferguson's great time of the 1990s, with Keane taking over from Eric Cantona as captain and Schmeichel deputising whenever the Irishman was unavailable.
But, behind the scenes, things were frosty between two of the biggest personalities in the United dressing room.
Keane described Schmeichel as a "poser" in his first autobiography in 2002 and referenced the tensions between them when Keane returned from injury in the summer of 1998, with Schmeichel reluctant to return the captaincy.
The Corkonian's second book in 2014 recounted that 1998 pre-season tour when things finally boiled over between him and Schmeichel.
I had a bust-up with Peter wehen we were on a pre-season tour of Asia, in 1998.
Myself and Nicky Butt had had a night out, and we bumped into Peter at the hotel reception desk. It was about two in the morning. We said a few words to one another - a bit of banter, a bit of stick. I went to Nicky's room ffor some room service, had a sandwich, got up to go - and Peter was waiting for me, outside the room.
There'd been a little bit of tension between us over the years, for football reasons...I wouldn't say we disliked each other, but we weren't best buddies either.
He said, 'I've had enough of you. It's time we sorted this out.' So I said, 'Okay.'
And we had a fight. It felt like ten minutes. There was a lot of noise - Peter's a big lad.
This week saw Schmeichel appear alongside Keane as a special guest on 'Stick to Football' in association with Sky Bet.
The pair reflected on their infamous bust-up in Singapore - with Keane leaving a subtle hint as to who had come out on top.
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Roy Keane and Peter Schmeichel reflect on infamous 1998 scrap
(The discussion of Roy Keane and Peter Schmeichel's scrap begins at 1:04:00 in the above video)
The tensions between Roy Keane and Peter Schmeichel had been festering for some time before the 1998-99 season.
With Schmeichel sitting alongside him on 'Stick to Football,' Keane admitted that his ex-teammate's reluctance to return the captaincy had added "another level" to their intra-team rivalry.
Given their big personalities, it's not hard to picture the two scrapping it out, especially with some drink involved. After they discussed the fight, co-host Jill Scott jokingly asked who had won the fight.
Schmeichel diplomatically said, "There's never a winner," before Keane left a subtle hint that he had come out on top by turning and discreetly winking at Scott.
The cheeky moment seemed to be missed by Schmeichel, though the duo appear to be on much better terms nowadays.
Reflecting on the incident, Keane said that such incidents never threatened to derail the overall harmony and desire of the Manchester United dressing room.
I think, when we go back to it, people falling out, fights, pre-season, people on edge...
The key I go back to, even when we [he and Schmeichel] fell out, I fell out with people - it never affected the team. We never came in the next day...it's happened. Obviously, there'd still be an edge with people, but the focus was still on Peter being in goal.
I still wanted us to win on Saturday, we didn't drag it out and it didn't drag the team down.
At the end of that 1998-99 season, the greatest irony was that Peter Schmeichel would captain Manchester United to victory in the Champions League final in Roy Keane's absence.
Though the pair never truly saw eye-to-eye, they certainly enjoyed terrific success together during United's glory years.
