Cassano moved to Inter in a swap with Giampaolo Pazzini this summer, though the Rossoneri also paid 7m cash as part of the deal.
"You seem affable and balanced. It's a shame you have only one defect: you support Inter and not Milan," Berlusconi reportedly told magistrate Ingroia in Palermo today.
"You Interisti will regret having taken Cassano off us. He won't take long to cause chaos in the locker room."