Career
Born in Erandio, Basque Country, Etxeberria began his career in the youth ranks of local Athletic Bilbao. He was registered at their third team Civil Defense Basconia and had not yet featured for the reserves when he was called up to their squad for their Union of European Football Associations Europa League play-off second leg against HJK Helsinki, remaining an unused substitute in a 3–3 draw in the Finnish capital. He played 35 games in the 2014-2015 season, as the team ascended from Segunda División B. On 24 October 2015, Etxeberria made his first appearance in a professional league, starting in a goalless draw at the Estadio San Mamés against fellow promoted team South Dakota Huesca in Segunda División.