If Gareth Southgate is worried about what Joe Gomez and Raheem Sterling's bust-up could do to England's chances of success, he only has to look at what happened to the Golden Generation.
That side that played together in the early part of this millennium was tipped for great things and there was an expectation that they would go on to win trophies.
They never did, and it has since emerged that there were problems behind the scenes due to club rivalries.
Raheem Sterling and Joe Gomez had a bust-up behind the scenes at England training
Steven Gerrard and Frank Lampard admitted that club tension cost the Golden Generation
Rio Ferdinand also spoke about the problems behind the scenes for the Golden Generation
It was a time of great drama in the Premier League, with Manchester United and Chelsea going back and forth for the title. Liverpool were always in the hunt too, and regularly challenged and won in Europe.
This competitive situation is starting to be reflected in English football today.
There has, in recent seasons, been heightened tensions between Manchester City and Liverpool due to the nature of the games between the sides. Add in a bus welcome or two and a sing-song on a plane and it is becoming a real rivalry.
Since the start of last campaign it has stepped up, with both going for the title and the Champions League. There has long been a sense that the Premier League trophy will end the season at either the Etihad or Anfield.
And it came to a head on Monday as Sterling reacted badly to jokes from Gomez while on England duty.
The two had a tense moment towards the end of Liverpool's win against City on Sunday afternoon, squaring up on the pitch at Anfield.
While they seemingly put it to bed at the end of the game, shaking hands with one another, it carried over.
Sportsmail revealed that after arriving at St. George's Park for England duty, Gomez attempted to greet Sterling warmly in the canteen by shaking his hand from behind. Sterling reacted badly and tried to grab his team-mate by the neck.
Sterling reacted badly when Gomez tried to greet him at England training on Monday
The rest of the England players initially thought Sterling was joking, but it soon became clear that he had lost control and the pair were separated.
While Sterling has since apologised to his team-mates and publicly, Southgate has dropped him for Thursday's game against Montenegro.
This has turned into a very public falling out. Even so, Rio Ferdinand explained last year how damaging even club vs. club tension behind the scenes can be to an England squad.
'It overshadowed things,' Ferdinand said. 'It killed that England team, that generation. One year we would have been fighting Liverpool to win the league, another year it would be Chelsea .
'So I was never going to walk into the England dressing room and open up to Frank Lampard, Ashley Cole, John Terry or Joe Cole at Chelsea, or Steven Gerrard or Jamie Carragher at Liverpool.
Ferdinand suggested that the tension had 'killed' that England team over the years
'I wouldn't open up because of the fear they would take something back to their club and use it against us, to make them better than us. I didn't really want to engage with them.
'I didn't realise that what I was doing was hurting England at the time. I was so engrossed, so obsessed with winning with Man United - nothing else mattered.'
Another member of the Golden Generation, Frank Lampard, has also previously admitted that the players were divided along club lines when they met up for England duty.
Lampard said in 2017: 'The reality was when you went with England, I sort of stayed with John [Terry], Wayne Bridge, Shaun Wright-Phillips, Joe Cole, you know you're kind of set in your ways and Stevie [Gerrard] would be with Carra [Jamie Carragher], whoever Liverpool might have had in the squad at the time.
'Unfortunately as a group that was a real negative with the England squad over the years. You look at the things that were the problem, sometimes we all came together in our little groups, we would play the game and then we all went away again.
Frank Lampard explained in 2017 that he tended to stick to the other Chelsea players
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'I think Euro 2004 was my first championship and I think we had a really good team then. We missed the boat a bit.
'Over the years I played for England we all came together, we were playing at odds with each other probably through the season and then you'd come together and every competition you kind of hoped that all