The match between Real Madrid and Chelsea is trickish kind of. But there is a strong determining factor in that very match, which is the availability of Karem Benzema. If Benzema is not available for Real Madrid they will big trouble in that particular match.
I think that the absence of Benzema in EL Classico is enough to prove that his influence is quite big enough for the team. I am sure that it was the best choice at that time because Benzema is experiencing a calf injury. ANd now he is in the recovery process. WIth around 2 weeks, I really hope that Benzema has recovered optimally, so he can be involved in the match against Chelsea. I am sure that Benzema has fit at all and ready to play with his team.
And let's see the interesting game between Real Madrid and Chelsea with all of their full team powers

if the worst is possible for Benzema when he has not recovered, it will certainly have a big impact again for Real Madrid. chances of victory could be Chelsea's if observers see Madrid having problems with their main players.
The fight between two big teams, of course, will be a concern for all fans. I will not miss placing a bet on this match. narrow win for Chelsea.