Barcelona cant repeat the shamefull performance of last two years, being stuck on group phase and falling into Europa League. So they are gonna be very akward on the draw this year.
Xavi its doing Barcelona play really good footbal, but in europe they are strugling to show that somehow. But i think with Gundogan its gonna be much more team than before, he was the key player they were missing.
The last two seasons have been a nightmare for big teams like Barcelona and they probably don't want that to happen again in the Champions League next season. As a coach Xavi is fully responsible for the performance of the team he has built and as long as they can still prove their capacity then they will probably be much better later.
The problem that often arises for Barcelona is its inconsistency while in European competitions such as the Champions League and it is still a question of how a team with so many good players can go down to the European league and even happen in a row. Gundogan will clearly be a differentiator because he is a game creator and his previous experience in Manchester City will certainly make Barcelona more confident.