Cassano insists the former Roma coach is incapable of working for another big club.
He told Domenico Sportiva: "Mourinho is good at talking and pulling the wool over people's eyes. He told people 'I love you, I love you, I would sign now' but he never stayed 10 years ago, when he had a team of phenomena.
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"He had to give something more and I have the impression that he's completely boiled over, he's at his wit's end, he can't coach anymore. Too much talk, too much cinema, fights, players throwing themselves to the ground, expulsions of staff and players.
"He complains about being dismissed after two finals? Let's remember that in Leverkusen he lined up 7 buses in front of the goal, 28 shots to zero. I'd rather lose 5-0 and play the game rather than make a fool of myself like that."