If there is one thing more harmful for a team than speaking out against the manager, it is upsetting the rest of the players and undermining the skipper.
That is exactly what John Terry has done by trying to muscle his way into power within the England camp. While his attempted mutiny may have been quashed, it was still hugely disrespectful and bang out of order.
Terry may still be bitter about the fact that Fabio Capello demoted him as captain, but he needs to get over it because he is causing real damage to the team's morale.
I think it's a classic case of money polluting a team and a player who is too proud and, some may say, spoilt - thinking his needs are bigger than the group's.
Terry has jumped on his high horse and that could cost him dearly because Capello does not take prisoners and would be entirely justified in cutting him adrift.
What is most worrying about it all is that Gerrard's role as captain is massively undermined, and the Liverpool midfielder has every right to be furious with his team mate over this.
Capello is the manager and the players must show him all due respect: what does Terry know about the requirements of the side as a whole? Very little, I can tell you.
If England's defensive options were not so depleted, Terry may well have been unceremoniously dropped. But, with the situation the way it is, the Chelsea man clearly feels he can take liberties.
I can tell you one thing, however: Capello will not stand for any more of this type of behaviour, and Terry will only have gone further down in his estimation, both as a man and as a senior member of the squad.
What the Chelsea captain has shown the England camp and the British public in terms of his character is pretty startling, and it does not endear the nation to the team, who are already struggling to garner support.
In any walk of life what Terry has attempted to do is entirely wrong, and there will be factory workers, white van men, etc up and down the country thinking he is a disgrace.
People are quick to judge, but when the public see monumentally rich footballers kicking up such a fuss despite being given the honour of representing their country at a World Cup they are justified in feeling angry.
There is simply no place for players to get on their high horses, and football is not a sport in which mutiny is acceptable - any backstabbing or disruptive behaviour must not be present in any form at a major tournament.
Perhaps because the defender is the Chelsea captain he is used to having control and expects to have his views aired, but he has to remind himself that he is nothing but one of the rank and file for England.
If this is a personal problem that Terry has with Capello then he must relinquish such grievances immediately for the sake of the team and the nation as a whole.
Terry is not pulling the strings like he clearly does at Stamford Bridge, and Capello is right to not entertain or humour the former skipper's opinions.
That is what the Italian gets paid handsomely to do himself.