Generate an approximately fifteen-word sentence that describes all this data: A.C. Milan, league, Serie A; Alessio Romagnoli, club, A.C. Milan; A.C. Milan, manager, Siniša Mihajlović; Alessio Romagnoli, position, Defender (football); Alessio Romagnoli, club, Italy national under-17 football team.
Sentence:
Alessio Romagnoli is a defender in the Italy national under-17 football team. He also plays in Serie A with AC Milan who are managed by Sinisa Mihajlovic.