City face arch-rivals Manchester United in the Premier League next weekend.
Mancini was forced to deny suggestions that he has banned his players from speaking about the upcoming derby over the next week.
He said: "No. I am not like other managers. I don't make this decision. I live in a free country where every opinion is free.
"I can't stop the opinion from my players. This is not true. I am used to saying what I think. My players are the same."