How AC Milan is getting stronger tactically under Gattuso?

The ugly AC Milan of the beginning of the season is a distant memory. The Rossoneri are now an entirely different team under the tenure of new coach Gennaro Gattuso who has revived the red and blacks since his arrival in November replacing the sacked Vincenzo Montella.

AC Milan recently reached the Coppa Italia final, will play an Arsenal in great difficulties in the Europa League round of 16 and Champions League qualification has never looked more probable. 

The Rossoneri are currently on an unprecedented 13 games unbeaten run but how AC Milan is getting stronger tactically under Gattuso?

https://www.youtube.com/watch?v=2o39XEsQIFk&t=457s


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