Athletic midfielder Dani Garcia was adjudged to have fouled Marcelo, with referee Gonzalez Gonzalez giving the spot-kick after revising the play on the pitchside monitor.
"I saw I had the situation under control and, through bad luck, I stepped on him. At no moment was it possible that he would get the ball before me. If you give one, you give the other," wrote Dani Garcia. "VAR is ruining football."
Iñaki Williams and Unai López also took to social media to complain about the refereeing. They both shared the image of Ramos stamping on Raul Garcia inside the area.