Take a look at Mohammed Tanko (Striker, free), Alejandro Pérez Jiménez (right winger, free), Alberto Montejo (attacking midfielder, free), Álex Zambrano (defensive midfielder, free) and Juanma Sánchez (defensive midfielder, free). I'd also suggest you to sign Nicolas Puydebois as your goalkeeper. I used him with Real Oviedo and helped me a lot.