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."
