I know a lot of people are very interested to see how Barcelona is going to perform in the Champions League competition. I honestly do not think that we should have big expectations from Barcelona. Personally, I do not think Barcelona will go very far in the Champions League. In my personal opinion if Barcelona can actually reach the semi-final of the Champions League I will say that it is going to be a decent performance from Barcelona.
Barcelona has always finished in the Europa League for the past two seasons. We can now see the club's additions and how Xavi is attempting to build a strong team with the players he currently has on board. I won't say they're not strong contenders for the Champions League based on how they performed in La Liga last season and won the title. They could replicate that in the Champions League and challenge for the title next season.
I also understand that you are trying to say Robert Levendoski and İlkay Gündoğan have lifted the Champions League trophy before. But they are quite old right now. So I cannot say that Barcelona is going to win the Champions League trophy because they are in the squad.
The presence of Lewandowski and Gundogan on the Barcelona team will benefit the entire team, even if they cannot give their best to win the Champions League. When you have experienced players on your squad, it boosts the morale of the other players and motivates them to perform better for the team as a whole. These are two outstanding players who have a lot relying on their success for the whole team.