Pique's replacement will be Araujo, but he had to undergo surgery due to an injury after playing for his country during the last international break. Without Araujo I think Barcelona's defense is in trouble, plus the absence of Crhistensen has made it difficult for Xavi to find a suitable replacement. Kounde isn't perfect after his injury either, but Xavi might take a lot of risks to play him in El Clasico.

Then instead of that, Roberto who is actually good at playing in midfield had to play at left-back because Bellerin was also injured. Xavi has really had problems with his defense especially in important matches and coincidentally when they have to play against teams like Inter, Bayern Munich and Real Madrid. They are all a big team, so it's really not good to expect Barcelona to be without problems when their best player at defender is injured.