Having fielded an ineligible player for their Copa del Rey match against Cadiz, Real Madrid face being booted out of the competition.
Russian winger Denis Cheryshev opened the scoring in a 3-1 win for Los Blancos but news of the embarrassing oversight had reached the Cadiz supporters during the game.
With Rafa Benitez's men facing expulsion from the competition, the news comes as a boost to their rivals, Barcelona.
The current holders of the cup, Barca eased to a 6-1 victory over Villanovense at the Nou Camp.
Gerard Pique was rested for the comfortable victory but, judging by this tweet, it's clear something amused the defender.
https://twitter.com/3gerardpique/status/672176304045838337
The tweet instantly racked up thousands of retweets, with many suggesting it was prompted by the events in Cadiz.
https://twitter.com/fabamos90/status/672322007237844992
https://twitter.com/RMadridHome/status/672176679842914304
https://twitter.com/foolofsoccer/status/672330751187243010
