Milan 's back line has lacked stability since the sale of Alessandro Nesta .
Romagnoli made his official Milan debut on the 18th of August , 2015 , in the 2015�16 Coppa Italia , playing the full 90 minutes and keeping a clean sheet in a 2-0 with over A.C. Perugia Calcio.  Six days later , the young central defender then made his first appearance in the league with his new club , as Milan lost 2-0 to ACF Fiorentina.  Romagnoli was sent off for the first time in his Milan career on the 27th of September , 2015 , after receiving two bookable offences in the first half in a 1-0 loss to Genoa CFC at the Stadio Luigi Ferraris.  Upon returning from his one match ban , Romagnoli re-established himself as the first choice center back and went on to perform on a consistent basis in addition to providing stability in Milan 's back line which has been not been seen since the sales of the legendary Milan defenders Alessandro Nesta and
Alessio Romagnoli