"Undiano Mallenco is not suitable for games like this," Goal.com quotes the 29-year-old as saying. "We were playing against 12. It's always the same.
"It's like they don't want us to win and wanted Barcelona back in the title race. I am not looking for excuses but I don't want to stay quiet on this. The referee was not at the required level for a big game like this.
"I have been here for five years now and I know how things work. If Barcelona had lost, they would have been out of the title race. I have never seen Real Madrid being favoured by the referees."
The win for Barcelona means that they are now a point behind Real and Atletico Madrid, who are level on 70 points at the top of the league table.