The Royal Spanish Football Federation (RFEF) has been unable to make a final decision on a new date for the postponed Clasico clash originally set for October 26 due to new input from La Liga.
RFEF confirmed the postponement of the match last Friday following political unrest in Catalonia.
Violent scenes have broken out in Barcelona after nine Catalan political leaders received long prison sentences for their roles in the region's 2017 referendum and subsequent declaration of independence last Monday.
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A rally in Barcelona has been called by pro-independence politicians for October 26, ultimately resulting in El Clasico's postponement for security reasons.