Do you actually expect a win against Barca? I mean it sure would feel nice, but as I see it a draw against BMG and home win against Celtic will get us through the group...
And that win would mean nothing if we were to lose against BMG, so a draw there is needed anyway...
Expect? No, never expect regardless of the opposition.
BMG could potentially turn Barca over in what could be a dead rubber for the latter which could see us miss out on qualification.