Juventus coach Max Allegri was happy with Filip Kostic's debut in victory over Sassuolo.

The former Eintracht Frankfurt winger was a second-half substitute for Monday night's opening Serie A win.

Allegri said, "I saw Kostic very well, because he entered and did well.

"He is a player who has great quality, he was an important purchase.

"I'm not talking about the market. You have to work well, a lot and above all keep the profile very low."