He first appeared with the main squad on 15 December of that year, coming on as a late substitute in a 1–1 home draw against SD Eibar in the Segunda División.
After one season at Xerez CD in the second level, he was loaned to Córdoba CF on 7 July 2006,[2] contributing seven goals to the latter's promotion from division three and signing a permanent contract shortly after.
Casaseca scored his first professional goal on 13 June 2009, his team's only in a 1–3 away loss to Real Zaragoza.
[5] He appeared regularly for the latter side, and on 5 July 2014 agreed to a two-year deal at UD Las Palmas.
[6] On 16 July 2015, after achieving promotion to La Liga, Casaseca terminated his contract with the Canarians[7] and joined Real Valladolid a day later.