Milan currently has players with injuries and also unable to play for other reasons, when they are complete they can be very dangerous so that they manage to win games, also the big teams have a chance to hire good players when the market opens again, I will give an example of juventus who are currently a shit team, but if they send the coach away and manage to put a good coach and buy good players when the market opens then juventus could still be champion, in the case of inter, for example, only this is them lacking to hire a good player for the attack, they could manage to be in the Top and be champions. in short: the big teams still have a lot of chances to be champions

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Struggling with injuries at this stage of the league is not so good. At this stage of the league it is important to get as much points possible. With  a complete squad Milan will play much better and win games easily. This is just how important and efficient having quality squad is, it gives you other options when you suffer injuries like this but I believe soon they will get back to good form again when the injured players start getting back to fitness.