Allegri was speaking ahead of their friendly in Australia against Perth Glory.
He said, "Napoli is the favourite to win the Scudetto because usually, whoever wins is always the favorite. Then there's Inter, who are strong and have been doing great for years.
"Then Juve, Atalanta, Roma, Fiorentina, and Lazio: there are many teams that will be fighting for the top four spots."
Allegri also said: "We're in the final stretch of the tour and we've worked well. We need to play seriously, respecting our opponents, who will give their all. It'll be important for them to compete against us, but it'll also be an important test for us to improve our physical and tactical condition.
"It's an important test mentally because against Arsenal and Liverpool, it was easy to maintain a high level of focus and concentration. Tomorrow we'll see how much we've improved mentally in terms of respecting our opponents."