Born in Ortigueira, A Coruña, Galicia, Trilli started his football career at Racing de Ferrol with his brothers, Raúl and Javi, where they played in the youth sector of the club.[2] He signed for Deportivo de La Coruña's youth side in 2014 before eventually getting promoted to their Juvenil B side for the 2019–20 season. Trilli accumulated 5 appearances during that season but due to injury and COVID-19, his playing time remained restricted.
Deportivo La Coruña
Despite struggling to get playing time, Trilli was called up to Dépor's reserves in Tercera División,[3] making his debut on 13 December 2020 by starting in a 2–1 away win over SD Fisterra.[4] The following 6 August, he extended his contract until 2024 and was called up for the first-team after pre-season.[5][6]
Trilli made his first-team debut on 29 August 2021, the first match of the 2021–22 Primera División RFEF, in a 5–0 victory over Celta de Vigo B.[7] Within a week later, Trilli suffered a muscle injury in the iliopsoas of his left leg and was assumed to be out for 3 to 4 weeks,[8] before returning to training in October.[9]
Trilli only returned to action on 1 December 2021, when he started in a Copa del Rey tie against UCAM Murcia CF.[10][11] From there, he made a further nine league appearances for the club before suffering from an anterior impingement in March 2022 that would leave him out for the rest of the season.[1][12] As a result, Trilli had surgery performed on his ankle in June 2022 and returned to rehabilitation with the club's medical department in July 2022.[13]
Following his return to fitness in August 2022 under Óscar Cano, Trilli was placed as a third-choice starter at right-back under Antoñito and Diego Villares, both of whom impressed during preseason in which Trilli was injured.[14][15] During the season, his lack of playing time was contributed by continuous discomfort with the left leg,[16][17][18] Trilli finished the 2022–23 season with 11 league appearances and was announced by the club that he was departing in July 2023.[1][19]
Barcelona
On 23 July 2023, Trilli signed a two-year deal with FC Barcelona after an agreement was reached with Deportivo.[20]
International career
Trilli is a Spanish youth international and has represented the Spanish U16, U17, U18 and U19 squads.[20]