Juve lost in a penalty shootout last week to Napoli in Rome.
“They had a good performance against Inter three months ago, but with both Milan and Napoli there was lots of possession and few shots on goal," Cobolli Gigli told Radio Sportiva.
“What I complain about with Sarri, someone I really do not admire as a person, is that he said Juve lost the Final because Napoli took better penalties in the shoot-out. In my view, we lost because we weren't determined enough.
“It's unacceptable that Juventus still doesn't have an identity. By signing (Cristiano) Ronaldo, Juve gave up on team football in favour of focusing on a soloist. Max Allegri managed to make it work, but Sarri hasn't.
“It takes a special coach to deal with star players and Sarri could get them to do what he wanted at Napoli, but he can't do that with Ronaldo. If he manages to win Serie A and go all the way in the Champions League, then he can keep his job, otherwise it's best to part ways as friends now."