It's still impossible to know whether or not Luis Enrique will continue as Barcelona manager next season. According to reports in Spain, he was offered a new contract by club president Josep Maria Bartomeu earlier this season, but is yet to respond to the offer. Enrique is struggling to make his decision, but it is fair to assume he won't be Barça boss next season, even if he does finish this one with a Treble, which is still possible.
While Enrique keeps mulling over his decision, it'd be wise for the club to probably start looking for a replacement.