 From 2008 to 2011, Ustaritz made a combined 36 league appearances, scoring his first competitive goal for the club on 29 November 2009 in a 4–1 away win against UD Almería.In mid-August 2011, he was loaned to fellow league team Real Betis in a season-long move.On 31 August 2012, Ustaritz's contract with Athletic was terminated by mutual consent.