The former Manchester City striker hit a double in the triumph.
"Balotelli's arrival has brought more excitement, but with his arrival, everything can't change positively and immediately. We have an important weapon, but we all must continue to do our best," said Tassotti.
"We cannot expect him to solve all the problems with his play.
"Three months ago, everything was difficult and we could not look too far ahead. Yet we cannot afford more missteps after the many mistakes of the past."