24-year-old Castel, has played at various Spanish sides like UE Rubi and Pamplona-based Osasuna, CD Tudelano, CD Lealtad and Las Rozas.
Last season with SS Reyes, he netted 13 goals, in the Segunda Division B side of the club.
He join a host of Spaniards in the team including Tiri, Piti, Noe Acosta and Aitor Monroy Rueda and new Spanish coach Antonio Iriondo.
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