The former Inter Milan striker made his move last week.
"Cassano knows that he will be relied upon as a player who has great respect and who is held in high regard," explained Donadoni.
"Otherwise, he would not have come to Parma. He will, however, face a very demanding Coach - he is a player of absolute value, so I will expect more from him than others.
"He is 31 and, with his maturity, he must try to smooth and improve the aspects that, over time, have penalised him."