Barcelona might need a quite long time to bring back their old days in the Champions League. Because I don't feel like it is only related to Xavi's strategies now. Barcelona are rebuilding with very young players mostly. This team will need some more time to be able to reach the level at which they can fight harder against the biggest favourites.

Hence I won't be expecting them to have a magical change this season as well. Maybe this time they would manage to complete the group stage successfully. But I don't think they still have a strong mentality to deal with big teams in later stages. This tournament is nothing like a domestic league.