Casemiro acknowledged Real Madrid are "not right" but insisted their effort could not be called into question following a 2-1 defeat to Valencia.
Madrid have endured a tough campaign and look set to only have the Club World Cup to show for it after the failures of Julen Lopetegui and Santiago Solari in the Santiago Bernabeu hot seat.
Los Blancos won three consecutive Champions League titles in Zinedine Zidane's first stint at the helm but failed to recreate that dominant form this season, suffering a last-16 elimination against Ajax.