A miracle only happens if there are some certain clear facts of it happening, in this case, no miracle is happening and Barcelona cannot stop Real Madrid from winning the La Liga trophy. I feel they will be without trophy this season after missing on the La Liga title and also not much hope in them in the champions league because of the way they’re performing and the big teams in the competition who can easily evict them from the competition when they meet.
Eviction is important because it's the weapon levelled against average teams. The UEFA Champions League is not an easy tournament for elite team especially Barcelona but somehow they managed to remain in the UCL this season, Xavi Hernandez and his entire squad will now focused on winning the La Liga title this season though it won't be easy for them but they can actually achieve it only when they've surpassed Real Madrid on the table. There's no miracle that will be triggered this season, Barcelona have to fight for a solid spot in La Liga this season because obtaining a prominent spot require strong ground.