With crucial matches looming, Flick is eager to avoid burnout among his key players, particularly as Barcelona continue to compete on multiple fronts.
"I think Lamine is very intelligent and knows how to manage the game," the manager said. "I spoke to him this morning to find out how he is, and he is very positive. I always speak to the players. If they feel something, they can come and tell me what is happening to them.
"Every player has responsibility for their bodies. If something happens or there is something different to normal, they have to speak. That's what we want because in my experience as a player, if you notice something and you don't take care of it, something ends up happening. I want the players to take responsibility for their bodies. It's an important thing when you play as a professional, at a level like Barcelona."