The two former Sampdoria teammates switched sides of the San Siro before the 2012-13 campaign began.
"Cassano is a real talent but totally unreliable," the former Milan and Italian national team boss commented. "Pazzini has less talent but is certainly more reliable.
"I've always believed in squad ethics and I have always chosen players who were, first of all, professionals with great motivation and generosity.
"Cassano is a lovable character, but sometimes the valve blows and he loses control. Hopefully that won't happen again."