Méndez developed through the academy of Montevideo Wanderers and made his professional debut on 19 November 2017 against Rampla Juniors in a 1–0 home win.[4] He scored his debut professional goal on 21 October 2018 against River Plate Montevideo in a 0–5 away win.[5]
Corinthians
In February 2019, he signed a four-year contract with Brazilian Série A club Corinthians.[6]
Internacional (loan)
On 1 July 2021, Corinthians sent Méndez on a one-year loan to fellow Série A club Internacional.[7]
Granada
On 26 December 2023, La Liga side Granada announced that Méndez would join the club on 1 January 2024.[8]
Following the injuries of Diego Godín and Marcelo Saracchi, he received maiden call-up to Uruguay senior team for friendlies against Brazil and France in November 2018.[9] He made his debut in a friendly that was played in London against Brazil on 16 November 2018 and played the full game.[10]
On 21 October 2022, Méndez was named in Uruguay's 55-man preliminary squad for the 2022 FIFA World Cup.[11]