The major issue is fatigue and I think Barcelona got through two tough games without too much damage. They have a solid few days in between tough games against Real Sociedad, Atletico Madrid and Valencia and then things get a little easier in the league. Enrique will probably use the likes of Aleix Vidal and Arda Turan a bit more and he already tried to reintegrate Rafinha in the Atletico game. Avoid any serious injuries and Barca should be just fine. Yes some tweaks defensively here and there but I don’t think its a concentration thing for this group of players.