Dybala has been linked with Inter in a swap for Mauro Icardi, where Marotta originally signed him for Juve.
The former Juve GM said: "Dybala-Icardi? The value of our striker is obvious, on the other hand, even if in a moment of involution in performance, Dybala is a very strong footballer.
"Also humanly, apart from the DNA that a footballer carries with him, the difference is made by the man. He has grown up."