 On 24 July 2019, Fati signed his first professional contract with Barcelona, agreeing to a deal until 2022.On 25 August, before even appearing with the reserves, Fati made his first team – and La Liga – debut, coming on as a late-game substitute for goalscorer Carles Pérez in a 5–2 home win over Real Betis.Aged 16 years and 298 days, he became the second-youngest player to debut for the club, only 18 days older than Vicenç Martínez in 1941.