Mancini was sacked by Soriano before the end of the season.
"I think Mancini is a champion, a winner. To change the mentality of the club was great.
"Other areas were different and more challenging and to the new manager we are asking this: We know we have very good players, very mature players, so if they are in an environment where there are fewer tensions they will be able to deliver more on pitch.
"I think [stories of tensions] have been a bit exaggerated. I have seen dressing rooms with tensions before. So we are not too worried about this and it's not the reason why we decided to change the manager.
"Having said that, with the new manager we are asking him that the dressing room has as much harmony as possible, knowing that total harmony is impossible."