Club career
Zubieta joined Athletic Club's academy aged 14. After progressing through the ranks (one season in the 'cadet' youth team, half a season with the newly-formed C-team before being assigned to the B-team, two further seasons there), she made her professional debut as a late substitute in a Liga F fixture against Madrid CFF in December 2022, aged 18, and her first start six weeks later in a defeat away to Alhama CF. On the back of her performances she was officially promoted from the reserves to the senior squad in May 2023, and signed a contract extension running to 2025. During her debut campaign she was mostly used in her preferred role of central midfield, but at the beginning of the 2023–24 Liga F season she became a regular starter as a central defender, with Athletic enduring an ongoing injury crisis in that position.
On 3 July 2026, Zubieta signed a two-year contract with Atlético Madrid.
