Zenit St. Petersburg is out no matter what, even if they beat Dortmund 10 goals to nil. They are currently down the table with 1 point in 5 games. Borussia Dortmund are leading with 10 points, followed by Lazio 9 points and Club Brugge, 7 points. These three teams can qualify depending on the outcome of the matches today.
Lazio will be playing against Club Brugge. If Lazio wins they will have 12 points, but if Brugge wins they will have 10 point and will be enough to qualify as second in the group. Dortmund are playing with Zenit St. Petersburg have nothing to lose or win so it may be a very easy game for Dortmund.