Barcelona are in a really troubling situation now in their group. Maybe they are still at the second position but they are only two points ahead of Benfica before the last matches. Benfica would defeat D. Kyiv easily most probably as D. Kyiv have no aim left in the CL. In that situation, Barcelona will have to defeat Bayern Munich away. Barcelona have started recovering as of Xavi's coming and they have made some changes in their game plan. But I wonder if Bayern Munich will let them win even though they are the leader of the group for certain.
There is no way Bayern can let them win, that's obviously not allowed in football, the only thing you can say is that, Bayern will prolly field a weaker team to give other fringe players some game time as they have already qualified and topped the group as well, thus if that is the case, Barcelona then automatically have the advantage, but we'd have to see the team list for Bayern first.
Having said that, all the pressure will be on Barcelona, they can't afford to drop to the Europa league, it'll affect their club reputation, they'll be hoping Dynamo Kyiv puts up a fight against Benfica and they themselves get the result against Bayern, it's really going to be an interesting final matchday in that group, and the final outcome could have real consequences.