Mendy made his senior debut for France in 2017 after previously being capped by France youth teams at under-16, under-17, under-18, under-19 and under-21 levels. He was chosen in France's squad for the 2018 World Cup, which they won.
In August 2021, he was suspended by Manchester City after having been accused and charged with rape by several women and he ceased to play for the club while under suspension. Having not played in nearly two years due to his arrest, City announced they would release Mendy when his contract expired on 30 June 2023.[35]
On 13 January 2023, Mendy was found not guilty of six counts of rape and one count of sexual assault, while Matturie was found not guilty of six counts of rape and three of sexual assault.