Hernandez, along with CD Lugo centre back Angel Dealbert and businessman Vicente Montesinos are believed to have taken over from the club's former president David Cruz.
Castellón are a former Segunda (Spanish second flight) team who now compete in Tercera Division Group 6, the fourth tier of football in Spain.
Hernandez's investment group 'Capital Albinegro' also includes Javier Heredia, Jordi Bruixola and Pepe Mascarell. The latter is a former executive at Valencia and sports TV chief in Spain.
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