If you look previous games of Barca, the team has been suffering big. They are not the team we used to see and cheer.
Whether Barca has been playing too many matches due to Champions League, La Liga, and other Spain cup, Barca needs to put together to win against teams that they have been beating.
I am very doubt that Barca can win either La Liga or Champion's League.
On the other hand, it's Real Madrid time to shine. I believe it's worth to bet on Real Madrid against Barca.
Sorry for Grammar Error.