Champions League winners in 2021, Chelsea will be favorites in a group that look comfortable on paper for Thomas Tuchel's club.
Milan failed to qualify from their group last year as they returned to the Champions League after seven seasons away, but this draw means they can't have any excuses for missing out on the last 16 again.
Salzburg reached the round of 16 last season, losing to Bayern Munich before claiming their ninth consecutive Austrian title. However, they lost key players such as top scorer Karim Adeyemi to Borussia Dortmund and Rasmus Kristensen and Brenden Aaronson to Leeds United.
Croatia's Dynamo Zagreb went through three qualifying rounds. Their record at this stage – three wins from their last 33 games in the group stage – suggests they will be beating boys.