The striker hasn't put a foot wrong since his arrival from Manchester City in January.
"The advantage for my Italy side is that by playing at Milan he can train with another four internationals," said Prandelli.
"Is he like Adriano? In the two years I worked with Adriano at Parma, he was very motivated. He was one of the best players I ever trained. It's a shame he settled with what he had already done.
"Mario has more pride than Adriano and wants to really prove he is one of the best in the world."