Career
Born in Dueñas, Palencia, Castile and León, Casado finished his formation at Real Valladolid, and made his senior debuts with the reserves in the 2012-2013 campaign in Tercera División. Casado played his first match as a professional on 7 June 2015, starting in a 2–4 home loss against UE Llagostera for the Segunda División championship.
