The midfielder is on-loan at Juve from Schalke.
Berhalter said, “I know Weston very well. His style of play and his spirit are so important for a team. I was sure he would play an important role in a top team like Juventus.
“He has room for improvement, he is still so young. Surely, he has been improving at Juventus. When you play every day with big champions like Cristiano Ronaldo, you can only improve if you really want it, and Weston wants to reach the top.