AC Milan's ambition to bounce back from their previous defeat against Genoa failed miserably as this past weekend they were humbled by Napoli.
The Rossoneri tried to put on an aggressive display since kick off but a defensive error cost them dearly as it was Napoli that went on taking the lead through Allan on 13 minutes.
After the break, Milan tried to get things going again, however, before they can establish themselves another poor defending allowed Partenopei scored their second.
It was Lorenzo Insigne that put Sinisa Mihajlovic's men under more trouble with his goal on 48 minutes.
Insigne continue to impress as he grabbed his second goal with a wonderful free kick 67 minutes.
Milan's misery continue as they conceded a fourth from an own goal by their young defender, Rodrigo Ely.