Asier Hierro

From Basauri in Biscay, Basque Country, Hierro joined the Athletic Bilbao youth academy at the age of ten. He scored 12 goals for CD Basconia (Athletic's farm team, based in his hometown and where he had first learned the game) in the 2023–24 season. Having been promoted to the reserve team, in November 2024 he signed a new multi-year contract with the club. Hierro made his professional debut for Athletic Bilbao on 5 November 2025 in the UEFA Champions League against Newcastle United, appearing as a second-half substitute in a 2–0 defeat at St James' Park. With fellow youth team product Selton Sánchez also making his senior debut in the match, afterwards they were congratulated by the members of the club's UEFA Youth League squad who had also travelled to Tyneside.

As of match played 28 January 2026