The match was postponed because of the protests that happened in Barcelona last month. Now, this date and time appear to be definitive.
Real Madrid will face Valencia at Mestalla on December 15th, so that week will be crucial for the team’s title aspirations given that they’ll play against Valencia and Barcelona on the road in just three days.
Furthermore, Barcelona will have 29 more hours of rest than Real Madrid as Messi and Co. will face Real Sociedad on the Saturday prior to the game. Zinedine Zidane and his coaching staff have every reason to be upset about this particular matter, given that El Clasico could very well be a very important game for the outcome of La Liga.