The 26-year-old arrived from Real Sociedad in the summer of 2025, for whom he made 236 appearances in all competitions at first-team level after graduating from the club’s academy.
In April 2021, Martin helped Sociedad win the delayed 2019/20 Copa del Rey against intercity rivals Athletic Club, alongside current Gunner Mikel Merino, and was also a teammate there of Martin Odegard.
He was ever-present in 2022/23 as Real Sociedad secured their highest league finish in recent history, ending the season in fourth place to secure Champions League football for only the third time, and the first in 10 years.
A Spanish international, Martin started all five games in the 2020 Olympic Games as they claimed silver in Tokyo and has gone on to make 19 senior appearances for La Roja, winning the 2023 UEFA Nations League.
He then helped his country defeat England 2-1 to win Euro 2024, coming on as a half-time substitute to make a huge impact for his country.
