Milan can enter the UCL zone if he can handle the next Big match well. Milan must win against Atlanta and Juventus to be able to lock a ticket to UCL.
But in my opinion it is almost impossible for Milan at this time to enter the UCL zone, from the remaining 5 matches apart from facing Juventus and Atalanta, they will also be troubled by Torino who are playing at home, as well as Cagliari and Benevento who want to get out of the relegation zone.
Benevento, Cagliari and Torino have 31 points. It is very difficult for AC Milan to win easily in their remaining 5 matches.
I agree that most of the remaining games of Milan are really tough. Especially Juventus and Atalanta games are the toughest ones of course as there is a huge fight for the 2nd place. Atalanta are the team which have the best form lately among these teams. So, I think they may end as the 2nd. And I'm not sure now about if Milan can leave Juventus behind. And Napoli's remaining games are the easiest as it seems. As a result, Milan have to work hard as well to end in top 4.