The RFEF have made a written request to allow them to call up Diego Costa, who obtained dual nationality on July 5, to the Spanish national side and are waiting for a response, according to El Pais.
Costa, who was born in Brazil, was called up the Brazilian national side by Luiz Felipe Scolari for their friendlies against Italy and Russia - only playing five minutes.
FIFA regulations state that a player with dual nationality can change federations if they are yet to feature in a competitive fixture at 'A' international level for their original association.
The 24-year-old, a summer transfer target of Liverpool, was overlooked for the Confederations Cup by Brazil - Spain have the opportunity to call Costa up for La Roja's last two World Cup qualifiers in October against Belarus and Georgia.
The striker was signed from Sporting Braga by Atletico Madrid in 2007 for €3.5 million before enjoying loan spells at Celta Vigo, Albacete, Valladolid and Rayo Vallecano.
Costa has now established himself as a key figure for Los Rojiblancos and is top scorer in La Liga alongside Barcelona's Lionel Messi.
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