Barcelona should just forget about progressing to the next round in the champions league because Inter Milan is going to win their next match at home against Viktoria Plzen which is too sure.
The equalizer of Lewandowski is not enough for Barcelona. That goal only delays the day Barcelona will officially be delegated to Europa League. In addition, the outstanding performance of Inter Milan shows that they will likely to win against Plzen. I don't think Plzen will be able to have points from Inter Milan that means Barcelona will know where they will play after a next match day.
Xavi has rescinded Barcelona to Europa League even though he is still going to be humiliated there again because of his incorrigible attitudes. He doesn't learn from mistakes. He's too prone to tactical errors. The nepotism orchestrated by Xavi in Barcelona would destabilize the club beyond redemption. His quest to favor Spanish boys is worrisome.
Xavi has made lot of good changes and improvements for Barcelona after a few months but he needs more time in Champions League. Maybe they need one more year to build up a strongly competitive team in Champions League.
In Champions League, mistakes will be sacrificed seriously and it is different than in national league like La Liga. Lot of matches to fix any mistake but still not waste chance to win a league trophy.