	Casado made his official debut with the "Merengues"'s first team on 20 December 2011, playing 70 minutes in a 5–1 home win against SD Ponferradina for the campaign's Copa del Rey (7–1 on aggregate). He scored his first professional goal on 8 October of the following year, netting Castilla's second in a 4–2 success at Hércules CF.