AC Milan have not scored in Serie A since December 2 and were held to a 0-0 draw by relegation-threatened Frosinone on Boxing Day.
Shot-shy AC Milan piled pressure on head coach Gennaro Gattuso as they were held to a 0-0 draw at struggling Frosinone.
The hosts entered the match with a solitary win to their name in Serie A this season but will rue not doubling that tally after a VAR review denied Camillo Ciano the breakthrough.
Samu Castillejo twice went close before then but, not for the first-time this season, a talented Rossoneri attack lacked cohesion and incision.