 He made his senior debut with the reserves on 13 March 2016, starting in a 3–0 Tercera División away defeat of Vélez CF.Casado spent his first two seasons as a backup to Aarón Escandell, and renewed his contract until 2021 on 30 March 2017.He subsequently shared the first-choice status with Kellyan, and achieved promotion to Segunda División B in 2018.