Gentile has been impressed by Juve's early form under coach Thiago Motta.
He told RAI Radio 1: "There is a new coach, who will still have to work to make his thoughts clear, it will take a bit of time. Despite the last result not being optimal, the team plays good football.
"We will see later to give a judgement on this Juventus. Scudetto? On the tenth day we will begin to understand the true value of this team, I am optimistic. There is a young coach who has achieved good results, his playing philosophy has not yet entered the mechanisms of the team, but there are the conditions to imagine a protagonist Juve."
On Dusan Vlahovic, Gentile added: "From what we saw in the first part of his career, he has shown that he is a quality player. He is going through a bit of a shadow period in which he is showing his true potential. I am convinced and optimistic that sooner or later he will emerge, he has physique, class, he has everything."