Xavi said: "They have only lost one game in the last five, they have beaten Atltico at home... They are playing well. Their football life is going in every sense, they are playing for the season. They come out well on the counterattack, they play directly... Tomorrow it will be difficult.
"We are going to see how the team's fatigue level is, but for us they are three vital games.
"If we don't win tomorrow, the La Liga is over for us. If we want to fight until the end for the League, we have to come out plugged in. If we fail tomorrow, the El Clasico will be of little use. Tomorrow is a transcendental day. I don't think we need to motivate the players much more.
"Next week there is a Clsico that, if we win tomorrow, could leave us five points behind. If we lose tomorrow, the La Liga is doomed."