 Unable to find a new club in the January 2008 transfer window, and still without a squad number, he was not eligible to play competitively during the entire season, but was reinstated for the following campaign, appearing in the 1–3 home loss against UD Almería on 31 August 2008.However, due to the permanence of veteran Koikili and the emergence of Real Sociedad youth graduate Mikel Balenziaga, Casas' opportunities were few and so, on 13 January 2009, he was loaned to Córdoba CF, which was then struggling in the second division, until the end of the season, where he appeared very rarely.Casas was released by Athletic in June 2009, joining FC Cartagena – recently promoted to the second level – on a free transfer.