Iraola renewed his contract with the club on 4 December 2013, keeping him at the San Mamés until 30 June 2015. In the 24th minute of his last league appearance against Villarreal CF in May 2015, Aritz Aduriz offered him the taking of a penalty kick but he declined, so the former converted it instead; the two players then combined for Iraola to score from open play four minutes later. He captained the team in his last match, the 2015 Copa del Rey Final which was lost 3–1 to Barcelona.