There is room for improvement everytime so I think that's exactly what Luis Enrique will do since he also gave other teams he won places to improve on. Their campaign last season was an excellent one but sometimes that's how football treat you maybe just a sign to let you know that there is actually no perfection in the field of play, I think the same thing happened to Bayer Leverkusen last time when they completed a perfect no loss campaign in their league and the entire football season but only to lose to Atlanta in the Europa league finals with almost similar scoreline.