Barca go into the game on the back of defeat at Bayern Munich and elimination from the Champions League.
Xavi said, "We must demand more from the players. We start from zero with more courage, desire and excitement. From now we have to see a Barça with soul. That's the message for the squad these last few days.
"The players are down. There's quality here to do more, but we have to believe. We're encouraging the players to do things, to be brave. It's psychological but also football-related.
"There are moments when we don't understand where the free man or the space is."
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