Espanyol shocked Real Madrid 1-0 with a last-minute goal in La Liga on Tuesday, as the visitors failed to move through the gears at the RCDE Stadium.
Gerard Moreno was the hero as Real gambled in the final moments, allowing the hosts to grab a dramatic winner in injury time.
The Budgerigars had the better chances as the game unfolded, and Real suffered in the absence of Cristiano Ronaldo, who was rested.
The defeat leaves Los Blancos 14 points behind Barcelona, who sit proudly at the top of the division.
Both teams provided their starting lineups, as the visitors hoped Gareth Bale would take centre stage during their trip to Catalonia:
The absence of Ronaldo clearly affected Real in attack, and the Portuguese icon was missed as the reigning La Liga and European champions ambled in the first half.