Gil began his professional career at Sevilla, and also had loan spells with Leganés, Eibar and Valencia in La Liga, totalling 67 games and six goals.

[6] Promoted to the reserves ahead of the 2018–19 season, he made his senior debut on 26 August 2018, starting in a 0–1 Segunda División B home loss against UD Ibiza.

[9] Gil made his first team – and La Liga – debut on 6 January 2019, coming on as a late substitute for goalscorer Wissam Ben Yedder in a 1–1 home draw against Atlético Madrid.

[18] Gil made his debut for the club on 19 August 2021 by starting in the UEFA Europa Conference League first leg tie against Paços de Ferreira, which ended in a 1–0 defeat.

[21][22] Having played just 85 minutes over nine league games, Gil was linked to a move back to La Liga in January 2022, to either Real Sociedad or Valencia.

[18] He made 17 total appearances for the club, including their penalty shootout defeat to Real Betis in the 2022 Copa del Rey Final on 23 April, in which he came on for goalscorer Hugo Duro with five minutes of regulation time remaining.

[24] On 30 January 2023, having made 11 appearances for Tottenham mainly as a substitute in the first half of the season – including winning a penalty and praise from manager Antonio Conte in the Champions League against Eintracht Frankfurt[25] – Gil was loaned back to Sevilla for its remainder.