Club career
Elche
Born in Molina de Segura, Region of Murcia, Mendoza represented EF Altorreal, EF San Miguel and Ranero CF as a youth before joining Elche CF's youth categories in 2019. He made his senior debut with the latter's reserves on 16 October 2021, coming on as a second-half substitute in a 4–0 Tercera División RFEF away routing of UD Benigànim.
Mendoza made his first team debut on 12 November 2022, replacing Josan in a 3–0 away win over CD L'Alcora, for the season's Copa del Rey. Twelve days later, he renewed his contract with the club until 2026.
Mendoza featured in the first team pre-season in 2023, being promoted to the main squad by manager Sebastián Beccacece. He made his professional debut on 30 September of that year, replacing Fidel in a 0–0 Segunda División home draw against Levante UD.
Atlético Madrid
On 2 February 2026, Mendoza joined fellow La Liga club Atlético Madrid, signing a contract with the club until 2031.


La Liga
Champions League