The Santiago Bernabeu side has already received three red cards in as many games in 2013, and Di Maria believes that the officials use different standards when Los Blancos are involved.
"The media knows more than anyone else that referees make mistakes and make confusing decisions," Di Maria said at a press conference. "I have seen some dismissals that would not have been red cards for our rivals, yet they were red cards for us. These things happen, but sometimes I get the impression that these errors do not happen by mistake."
The Argentina international then went on to say that Madrid's focus is on the Copa del Rey and Champions League, with the club falling to a seemingly insurmountable 18 points behind La Liga leader Barcelona in the race for the league title.
"Last year the league was our main focus, but we have now set our sights on the Copa and Champions League. We want to win both trophies," Di Maria said.
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