Asked if he fined the players, Mancini said: "Yes. We fine them because we mustn't do this (fight) but sometimes it can happen and we fine the player, the player pays and in the end any money may go to charity.
"It's never serious because it starts and finishes in two minutes and in the dressing room everything is finished."
Mancini then joked: "Sometimes we fight for them (the photographers) so they can sell their pictures." He added: "Seriously, this happens in every team. The difference is that here we don't have a big wall around the training ground.
"I played football for 20 years and I know that in every team sometimes these things can happen, because you train and play at 100 per cent.
"Did I fight with team-mates? Yes, about five times. One time, when I was young at Sampdoria, I had a fight in training against Trevor Francis. I don't remember the cause of it because it was about 25 years ago but I remember very well the fight.
"It's important that afterwards it [the argument] was finished. Am I bothered about the pictures or headlines in the newspapers? Absolutely not."