My friend, there have been three matches played and we are at the very beginning of the league. They drew two and lost one. It is true that they did not play well, but I think they need a little more time. Because they managed to beat big teams in the preparation matches with Fonseca. They played very good football during the fight against these teams. It is possible for them to have a winning streak again.
In pre-season, AC Milan was able to beat big teams such as Madrid, Barcelona and Man City. But that's just pre-season and the real performance is what can be seen now at the start of this season. But if they are able to play as well as they did in pre-season then AC Milan could be quite a scary team this season. but I doubt they will recover quickly. but yeah let's wait until this season almost reaches the middle of the season. because maybe Fonseca really needs more time to build this squad so that it has much better performance and wins lots of matches.
It seems that Fonseca favors the 4-2-3-1 formation in every match that Milan plays. He focuses more on ball possession in their strong midfield. When they are in an attack-building scheme, they will only leave 2 defenders. While in the middle, they also often lose the ball when building attacks.
Fonseca will not get much time to build the team. If Milan still does not get positive results from the next matches, it could be bad for Fonseca. There are even rumors that Fonseca is required to win when facing Venezia in the next match in Serie A.