FC Barcelona can win their group and qualify for the UEFA Champions League knockouts today with a win against Borussia Dortmund. That’s the easiest way for the Catalans to advance. Doing so would put them on 11 points, with Dortmund stuck on 7 and Inter Milan on, at best, 7. In the last match either Dortmund or Inter would only be able to get to 10 points, still one short of Barça.
However, other scenarios exist.
Draw vs. Dortmund, win vs. Inter Milan
A draw for Barcelona would put them on 9 points and Dortmund on 8.