Zinedine Zidane was frustrated by Ronald Koeman's complaints about refereeing decisions in Real Madrid's favour, insisting he would never engage in such a debate.
Barcelona coach Koeman said on Monday he could not understand the failure to award a penalty to Eibar late in their 3-1 defeat to Madrid.
Eibar trailed by just a single goal at the time when the ball appeared to strike Sergio Ramos on the arm inside the penalty area.
Editors' Picks
No spot-kick was given and the on-field decision was not reviewed, a call that Koeman, who also took aim at VAR during his team's Clasico defeat to Madrid in October, claimed nine out of 10 people would disagree with.