Juve will start the campaign as favourites.
"The values of clubs are changing, our rivals are getting stronger," he told the Gazzetta dello Sport. "It will be a very open championship.
"Juve, Milan and Inter are traditionally title contenders. Napoli have spent 75m-80m and have reinforced with Rafael Benitez, a great Coach who has won it all.
"Lazio have amplified their squad and are tough, tactically strong.
"Roma, meanwhile, will try to invest the money they got for Marquinhos [32m from Paris Saint-Germain]. They should be complimented for that move, that was a great deal."