Inter Milan coach Antonio Conte was delighted with Sebastiano Esposito after their 2-0 win over Borussia Dortmund.
Lautaro Martinez and Antonio Candreva decided the Champions League result with a goal in either half.
Esposito came off the bench and earned a penalty, missed by Lautaro Martinez, on his Champions League debut.
Conte said, “I've said before in interviews and in the dressing room that I'd be crazy to keep a 17-year-old if I didn't trust him. I do trust him, he's an important player for us and I am sorry he was unable to go on the Under-17 World Cup for Italy, but we really did need him and he proved that tonight."