Dybala has battled to get off the bench at Juve this season.
But Allegri maintains: "When Messi and Ronaldo get older, it will be Neymar and Dybala who will be the best players in the world.
"He has a whole lot of football ahead of him and I know that he can keep improving."
Going into 2018, Juve insist they're well placed.
Allegri added: "There is still a lot of football to be played so we have to keep doing well. Five of our next seven games will be on the road so we will have to be very good indeed.
"Napoli have been incredible in 2017 and they play a great style of football. We are also there and we are waiting for them to slip up."