Gerard Martín

On 19 July 2023, Martín signed a two-year contract with Barcelona B, arriving from Cornellà. At the former side, he was viewed as "one of the key defensive players" under former club player Rafael Márquez. On 17 August 2024, he made his La Liga debut with their first team, coming on as a 63rd-minute substitute for Alejandro Balde in a 2–1 away win against Valencia. Martín scored his first professional goal on 2 March 2025, from a cross by Dani Olmo in a 4–0 victory over Real Sociedad at the Estadi Olímpic Lluís Companys. He contributed 28 league appearances for the eventual champions, making 42 in all competitions with 19 starts. In the 2025–26 season, still under Hansi Flick, Martín was often deployed as a left-sided centre-back. He stated in an interview that he felt comfortable both as a full-back and a stopper, highlighting his tactical versatility. He explained that his transition to the latter role began during preseason, where he continued training until he felt fully prepared; he added that adapting to different defensive responsibilities helped him to develop his confidence and understanding of the game, also describing playing at the Camp Nou in major European matches as highly motivating for his progression.

Martín earned his first cap for the Spain under-21 side on 21 March 2025, in a 2–2 friendly draw against the Czech Republic in Lorca. He was selected by manager Santi Denia for the 2025 UEFA European Championship finals, but had to be removed from the squad after the first game due to a hand injury.

Martín has been described as a very reliable defender, excelling in marking and the aerial game.

Born in Barcelona, Catalonia, Martín moved with his family to Sant Andreu de la Barca at the age of five.