Fuenlabrada need just a point at Deportivo to finish sixth in Spain's second tier and take the final promotion playoffs spot.
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La Liga club Sevilla became the fifth club in Spain to confirm that a member of its squad has been infected with COVID-19.
Fuenlabrada will miss the chance to seal promotion to La Liga for the first time in the club's history.
The game between relegation-threatened Deportivo La Coruna and promotion-chasing Fuenlabrada was postponed on Monday.
Fuenlabrada midfielder Cristobal Marquez was sent off twice in his side's 1-0 defeat to Girona in the Spanish second division.
Gareth Bale made a welcome return from injury to spare Real Madrid embarrassment in their Copa del Rey clash with Segunda B leaders Fuenlabrada.
Real Madrid defeated Segunda B side Fuenlabrada 2-0 in their Copa del Rey round-of-32 first-leg tie on Thursday.
Real Madrid coach Zinedine Zidane has rested key players including Cristiano Ronaldo for Thursday evening's Copa del Rey game at Fuenlabrada.
Fuenlabrada play in one of Madrid's satellite towns in Spain's amateur third tier, so imagine the madness of hosting Real Madrid in the Copa del Rey.