For Juventus, I agree with you, they really have the chance to become Serie A champions this season. However, for AC Milan, maybe they don't have it. The reason is that Milan will now play in the UCL, which maybe Milan team has less time to rest, so Milan players might be experience fatigue while playing in Seire-A. I think staying in 2nd place end of season is a good position for Milan.
I personally believe that Juventus will have the opportunity to win the Scuddetto this season, Juventus this season has a capable squad and not too many changes to their team, especially after the arrival of Locatelli will certainly make their game more aggressive, besides AC Milan of course there are several other strong teams that can being a contender for juventus this season to win for the scudetto, of course we also can't underestimate teams like atlanta and roma, especially atlanta, i think they will be ready to give a surprise this season as happened last season.