The 22-year-old failed to take his chances at the San Siro as the Serie A clash between the two Milan teams ended in a 1-1 draw.
"It was a difficult game for him, both psychologically and because we had taken precautions for him," Moratti told reporters.
"So we can say he had a good match. The missed goals are something relative, since he had already done a good job simply getting to those balls, and it wasn't easy to finish the chances."
Balotelli left Inter for Manchester City in the summer of 2010.