One of the toughest tasks managers have is trying to create a harmonious atmosphere within the squad.
It is certainly easier said than done, however, having so many lavishly paid players with big egos all under the same roof can be a toxic combination at the best of times.
Therefore it's no surprise when you hear of certain players not quite seeing eye-to-eye with one another.
Disagreements and arguments are to be expected in any big club or organisation but the tale of William Gallas' fractured relationship with Samir Nasri at Arsenal is a bit more sinister than that.
Gallas has revealed how the French duo's dislike for each other grew to such an extent that he even feared he was going to be tasered during one peculiar incident in 2009.
"What you need to know is that I was staying at the hotel with my family," Gallas said on French TV channel RMC, as per The Mirror.
"I was with my cousins for a meal, it was the eve of a gathering of the French team.
"At the end of the meal, I went out of the hotel and some people approached me and wanted to talk with me. Initially, I did not want to, then I recognised a person who was often with Samir at the Arsenal training ground.
"A few days before, we had had an altercation about comments that he may have made about me, and I did not like them [the comments].
"This person wanted us to talk and wanted me to see Samir, who was in a car further away so I got ready to follow him - but my cousin, who is a policeman, told me in creole not to follow him.
"At the same time, I glanced inside and I saw someone crouched down with a bag. In the bag, there were Tasers. I didn't know why. But luckily I was with people that day, because I do not know what could have happened."
You don't hear that sort thing every day. The life of a footballer really is crazy, isn't it?
It is believed the pair's feud started a year before that when Nasri sat in Thierry Henry's seat on the French team bus - shocking, we know - and Gallas felt it was a lack of respect.
Arsenal fans often wondered why their side underperformed so frequently during the late 2000's but after finding out that a player thought a teammate was going to taser him, it isn't quite so surprising the Gunners often buckled on the big occasion.