Athletic Bilbao captain Iker Muniain became the latest player to question refereeing decisions involving Real Madrid after Sergio Ramos scored a decisive penalty at San Mames.
Madrid were made to work hard for a 1-0 victory on Sunday - their seventh win in a row - as Zinedine Zidane's men moved seven points clear at the top of the La Liga table.
But Athletic were unhappy with the award of the spot-kick from which Ramos clinched the points, with Dani Garcia's trip on Marcelo spotted only after a VAR review.
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Muniain was particularly frustrated as there was then no similar call made at the other end of the pitch when Ramos appeared to step on Raul Garcia's foot off the ball.