I suppose there's a way forward if we only lose this game by one goal, or lose the game by two goals but scored at least one ourselves (3-1, 4-2, etc.). We beat Slavia while Dortmund loses away to Barcelona, and then match Dortmund's result on the last matchday against a Barcelona side that's likely already through.
But it's a low-percentage situation. A draw would suit us fine. Hopefully we do one-better because then we would be in position to clinch a spot in the knockouts on the fifth matchday. But that's looking too far ahead; lets play a good game on Tuesday and see what happens with it.