my prediction for Barcelona to not qualify for the next round is still alive, but i have to admit that it's tough right now for Inter to get 2nd place, if they were able to get a draw out of Bayern Munich in Milan there chances could have been way better now, but there is hope still, if they lose against Barcelona it's over, but a draw could make things really interesting.
Barcelona need to win at least two more times in the three remaining matches in the Champions League group stage, as Barcelona are three points behind Inter Milan and 6 points behind Bayern Munich who are currently in first place in Group C. So Barcelona's toughest opponent is Bayern Munich, apart from Inter Milan and for Viktoria I think it will be very easy for Barcelona to handle because Viktoria is not a strong team in Group C this season.
Now Barcelona having two home games first against Inter and then Bayern Munich which is not easy but if they are able to have one win from these two games then surely they can go with good result into second round because they have one game which is against Plzen and this can give them good win as well so right now most important thing is they have to win first match against Inter because this will give them a good confidence for staying into hunt for qualifying into next round.
With most chances Bayern Munich is going to be stayed as group leaders now fight is going between Inter and Barcelona which is surely favourable for Barcelona because they have better squad and quality for doing good performance and having good chance for qualifying into next round.