AC Milan coach Massimiliano Allegri says Antonio Cassano isn't ready to start a game.

Cassano, back after a heart operation, made his return in defeat to Fiorentina on the weekend.

"Cassano? Players are not machines. Cassano was out for five months. He's only completed two and a half training sessions since and he's played just 15 minutes. It will take time for him to start a game," said Allegri.