Roberto Donadoni has accused former Napoli employer Aurelio De Laurentiis of knowing nothing about football.
De Laurentiis sacked Donadoni on Tuesday and immediately replaced the former Italy coach with Walter Mazzarri.
"President De Laurentiis is a volcano," Donadoni told La Gazzetta dello Sport following the end of his seven-month reign.
"He knows very little about world football and needs to learn a lot.
"He does not breathe enough the atmosphere of the dressing room.
"I have nonetheless had the chance to appreciate a splendid person. Our last meeting was very cordial, but I told him that if he asked me three questions about cinema, I would not know the answers.
"On the other hand, he would remain silent if I asked him three questions about football. I said so without malice, because I am not holding any grudges."