The work of Barcelona will be even greater before they play an el clasico match. This is because their chances are slim if they are not able to beat Inter Milan. Victory is the only way if they still want to play in the Champions League this season. While Real Madrid will be easier, I consider this to be a strengthening of their game before El Clasico later.
Real Madrid must prepare well because they have the advantage of a tough Barcelona game in the Champions League. They have to see it as an opportunity for them.
Obviously they have to do that now because in any case a win is a must for Barcelona considering their points in the Champions League are so worrying.
Their points have now been lost to Inter and Bayern and with things like this if they drop points again it is certain that a second Europa League is waiting for them.
With a squad that is considered as one that can be competitive for the Champions League, it seems that Barcelona is still struggling with that.