"In my first days at Inter we had some problems, but then it turned into a mutual respect, and now we have a real friendship.
"It is never boring playing under Jose. When you are in Mourinho’s team it is a family and he coaches on the principle that if all is well with the family it doesn’t matter what is going on outside the team."
Balotelli scored 30 goals in 80 matches during his spell in the Premier League with City, which ended in 2013 when he joined Milan.
Mourinho, who endured a tempestuous relationship with Balotelli during their time at Inter, has complained of a lack of killer instinct from his strikers this season.
Chelsea are currently top of the Premier League but have scored 21 goals fewer than third-placed Liverpool.