Sinisa Mihajlovic said he’s “never lost a derby” and insists Milan players “are not children” hurt by criticism.
The Derby della Madonnina kicks off on Sunday at 19.45 UK time (18.45 GMT), click here for a match preview.
“The Belgrade Derby is one of the most fiery events I’ve taken part in. Playing for the side you supported since childhood is remarkable, even if in my day Red Star were much stronger than Partizan.
“As a Coach I have never lost a derby and I hope that run continues tomorrow,” Mihajlovic told Milan Channel.
He was very critical of the Rossoneri after their initial two Serie A games against Fiorentina and Empoli, sparking reports some players complained to the club.
“We have to play the way we prepared and we’ll do well. My methods can appear brusque, but I am accustomed to saying what I think and I am never satisfied.
“For the last three years, Milan have not been Milan. It takes time to make the change, but we have to think as if we’ve got no time left.
“I am very demanding with my team and myself. We must have more courage and belief. My players are not children, so they weren’t offended by my words.
“It is difficult to shake off years of insults from the crowd. We must be proud to wear this jersey and not feel the weight of that pressure.
“Playing for Milan is the dream of every child and you need to enjoy your football when stepping on to the field. I think my main work here will be psychological, as we have to play in order to win rather than to simply not lose.
“I ask the fans for support tomorrow and to encourage the squad.”