People are saying that it will be enough for Chelsea to get one point against Salzburg to guarantee their qualification from the group. It is really the most likely thing to happen today. Milan are in a very complicated condition in the group so they must get a win over Dinamo Zagreb to get into a better position to qualify. Milan should be able to defeat them one way or another. I don't expect them to have the same fate with last season which they were out of the Champions League in the group stage already.
A draw would not be enough for Chelsea to qualify for the next round. In fact, it would further open up the group and give almost all the teams the opportunity to qualify. A win today regardless of the goal margin would guarantee Chelsea's qualification to the next round. Chelsea's last performance against Manchester United would be a big boost to the team's morale; hence I am expecting them to comfortably win the match. RB Salzburg has been a good side but their fate would be determined by the result of the match between Milan and Dinamo Zagreb because Chelsea would win this match today.
Looking at this group remaining fixtures, I pick Ac Milan and Chelsea to qualify to the next round. Ac Milan have Dinamo Zagreb and Salzburg at home to play, and they will definitely beat Dinamo Zagreb away and win Salzburg at San Siro. Chelsea only need to draw against Salzburg tonight and beat Dinamo Zagreb at Stamford bridge. Salzburg do not have easy fixtures remaining. Im not sure they can beat Chelsea and Ac Milan. So I pick Milan and Chelsea to qualify from the group.
Today's match result wouldn't determine the team that would qualify for the next round. AC Milan doesn't have a reliable team currently, hence I am not sure they would be able to beat Dinamo Zagreb and win RB Salzburg. They might be able to win Dinamo but if they miss their chances and get a draw or a loss, then they should forget about qualifying because Salzburg would not be an easy side to win.