Allegri revealed Cassano could be on the bench for tonight's game with Cagliari.
"It's the last chance of Cassano's career and he cannot fail," said Allegri.
"Right now it's the desire that counts and he is showing us that he has it.
"He has a 70 per cent chance of starting on the bench, but there is still a 30 per cent chance he'll start from the beginning."
Allegri also gave his reaction to Silvio Berlusconi's comments that a winning Milan is good for Italy.
"Compliments always make me happy. We always need to keep our ears open with Silvio because there is always something to learn.
"For now we are at the top of the table and I believe it's very important. I am sorry above all for our slip ups against Roma and Juve."