Real Madrid president Florentino Perez reveals the club will fight any sanctions levelled against them for fielding an ineligible player in the Copa del Rey.
Denis Cheryshev started the fourth round tie against Cadiz and scored the opening goal in a 3-1 win for Los Blancos.
However, it has since been revealed the Russia winger was actually suspended for the tie after picking up his third yellow card of the competition in last season's semi-final while he was on loan at Villareal.
The player was substituted shortly after half time when Real had been alerted of the error with head coach Rafael Benitez saying the club wanted to show good faith.
Last season, Osasuma were disqualified from the tournament for fielding an ineligible player when they picked too many non-EU players in a match back in 2001.
However, Perez is confident the situations will be viewed differently because no-one from the tournament organisers or Villareal notified either Cheryshev or Real Madrid about the ban.
"Nobody told the club or the player, not the federation nor Villarreal, so it was impossible for us to act differently. It's not our fault," he said at a press conference.
"What happened last night has never happened to Real Madrid before. If we didn't know, the sanction cannot stand.
"We checked the situations of all of the players listed in the squad rigorously before yesterday's game. Look, in the football section, there is a department dedicated solely to these kinds of issues; no-one told them about Cheryshev.
"Sanctions cannot be enforced unless the player is personally notified, that's the way I understand it."
The winger himself confirmed that he had not been notified.
"I did not receive any notification from Villarreal to inform me that I had been banned from playing in the Copa del Rey," he told the Real Madrid website.