The Barcelona team will play at their best to do well in the Champions League. Barcelona's team performed very poorly in the Champions League last season. This season coach Xavi has added some new players to the squad who will look to create a strong team with a lot of experience in the new equation so that Barcelona can do well in the Champions League.
Barcelona has indeed experienced a bitter season and even now I actually still doubt the performance of its players in the Champions League this season. Maybe they managed to get Gundogan, Joao Felix, or Joao Cancelo to strengthen their squad but I still don't see them being a tough challenger for teams like Bayern Munich, Manchester City, or Real Madrid in this competition. I think barcelona should be able to get past this group stage first and after that we can see where Xavi's squad is going.