The two clubs meet today in a preseason friendly.
"Napoli have signed many important players and did very well on the transfer market," Terim told Sky Sport Italia.
"Rafa Benitez is a great Coach and Gonzalo Higuain an excellent striker. In recent years I have seen Napoli grow. Aurelio De Laurentiis did a wonderful job and I'm sure they can be Scudetto challengers this season.
"Napoli often finish in the top four, but this time they want to win."