|Real Madrid could face disqualification from the Copa del Rey after appearing to field an ineligible player in their fourth-round clash with Cadiz.|
Denis Cheryshev had given Rafael Benitez's side the lead at the Ramon de Carranza but the Russia international had a one-game ban hanging over his head.
The 24-year-old had picked up three yellow cards during the competition with former club Villarreal last season and this was the first opportunity the winger had to serve the accompanying ban.
But, with Benitez making a host of changes, Cheryshev's ban was overlooked as he started against the third-tier side.
Last season Osasuna were kicked out of the tournament for playing an ineligible player as Unai Garcia was selected in the win over Mirandes despite being sent off the previous year.
Cadiz will have to report the situation to the Spanish Football Federation on Thursday, which could lead to 19-time winners Real being eliminated from the tournament.
Benitez was manager of Valencia when they were disqualified from the Copa del Rey having played too many non-EU players during a tie against Novelda in 2001.
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