Barcelona is a great club with fantastic manager and phenomenal players who are capable to conquer any club in the world on their day but I don't think they're one of the favorites to win the UEFA Champions League competition next season.
There are still other European clubs who's got more quality players compared to Barca.
From dropping to Europa League play-off matches and failed under Manchester United, to win Champions League after only one summer, it is very big difference which I don't think will happen. There are many clubs that are stronger than Barcelona in Champions League and Barcelona don't have too big chance to win the trophy in a new season.
Xavi Hernandez is still building the team to become one of the unbeatable clubs in Europe which I think will happen in few seasons from now considering their level of development
Xavi has been doing great management in Barcelona, won one La Liga with them but he needs more time to build up a stronger and more competitive squad in Champions League. It is necessary condition which is not enough to win Champions League. Without luckiness, a strong squad is not enough.
Barcelona has a chance of course but I don’t see them winning the Champions League title. Xavi has done a fine job in making a good enough team to clinch the la liga title last season. With their recent signings, they’ve added some experienced players to the squad. But I doubt all that would be able to get them the champions league trophy. Barcelona is a strong contender but the chances of winning aren’t that great.
First, Xavi and Barcelona must build up a stronger squad successfully and later they will need luckiness to go far in Champions League and win the trophy. The second condition is not what they can control in their hands but they need to prepare first condition as best as possible for a new season.
It's not easy in a very competitive Champions League, with likely coming domination from Manchester City. That club might have two or three more seasons as one of strongest clubs in Champions League and they will be barrier for any club that want to be champions.