Carlos Tevez and Edin Dzeko's displays of dissent against Bayern Munich were added to this week as Adam Johnson showed his frustration at being substituted against Villarreal and after the game, Sergio Aguero allegedly incited a scuffle in the tunnel following his last-gasp winner.
And Mancini admitted to The Times: “It’s different at Manchester United, maybe 25 years ago you had this situation.
“We need to improve this but after three, four years, this situation won’t happen. Then we have the players we want. You can’t change it in two years.
“I looked at myself on the television and sometimes I was ashamed. Every day we can make a mistake.
"What’s important is that you apologise to everyone. I always apologise, the day after. You can say sorry to make things better.”
Johnson was seen shaking his head as he was subbed off in the first-half in mid-week but Mancini defended his tactical choice.
“Maybe he would be upset but this is football,” he said. “If your team has a problem, the manager is there for this. I needed one more midfielder. After five minutes we scored a goal. It was a good decision.”
Mancini was confident that City can soon improve and is counting on some of his senior players to lead City to glory and even praise Mario Balotelli's maturity following his positive start to the season.
He continued: “I feel safe, I feel I know this job now. The first two years were always going to be the hardest."Vincent [Kompany], Yaya [Toure], [Sergio] Aguero, [Aleksandar] Kolarov, Kolo Toure, these are serious, very professional players.
“And Balotelli, he started playing in the first team at 16, 17 years old like the top players, like Ronaldo, like Messi.
“The difference with them is the mentality. But now it’s been two months that he’s had good behaviour in training, with his team-mates.”