Chelsea and Paris are the only difficult games for Barcelona. They can even lose those two games, and as long as they get 12 points or so from the other six games, which is just four wins, then they will be fine. If they can't get 12 points out of Frankfurt, Brugge, Olympiacos, Praha, Copenhagen and Newcastle, then they shouldn't be moving forward anyways.

I am sensing that they won't even pass Chelsea and PSG with zero points neither, I bet they are going to do fine. They still do need a proper striker though, Lewandowski is great but he is missing so many games, so they have to replace him with Ferran Torres and Raphinha sometimes, and while those are amazing players, they are not pure strikers, and they need one.