The Senegalese youngster was outstanding in last night's Coppa Italia triumph over Reggina.
Mihajlovic said: "If he improves he becomes more important. We hope he grows with us, we will not send him anywhere.
"And he 's a little weird as a character, calm, angry a little also.
"Today he was good. A starter for Cagliari? We also need to see how Adrian Mutu is."