That's just conspiracy theory. Chelsea's "efforts" to eliminate Barca by helping Werder will be in vain if Barca wins their last two games.... Chance for Barca to advance to k.o stage is GOOD considering they'll play a weak Bulgarian side and hosting Werder Bremen in the last game.
Now, Chelsea may rest some key players for tomorrow games not because they're doing anyobody favor, they're having a big showdown on weekend with Man Utd at Old Trafford; there some clues. Based on this assumption, my $$$ would be safe on Werder, however, for some reasons this German side has tendency to choke in crucial game........
For now I'm rooting for Barca, still doing more homework on others......