 During the January transfer window another loan happened, this time to Catalonia's Gimnàstic de Tarragona where he started very well with three goals in his first three matches, although the club would be eventually relegated and the player returned to Deportivo.After appearing scarcely during the 2007–08 season, Castro was loaned again in July 2008, to newly promoted second division team SD Huesca.There, his goals proved crucial for the Aragonese as they retained their recently obtained second level status.