Theo scored twice from left-back for the rout.
Pioli said, “If he plays with this attention, being inside the game with a little more mental vivacity, he's very strong.
“He can play both phases very well, with his physical abilities it is enough to stay in the game. He can very well become one of the best.
“He has only been playing continuously for a year and a half, I always tell him that he must not be satisfied with being talented.
“He has an incredible physical strength and quality, he must prove that he wants to become the best every day."