[7] Nash made his European debut for Munster in their final pool 4 fixture of the 2019–20 Champions Cup against Welsh side Ospreys on 19 January 2020.

[17] Nash was selected in the Emerging Ireland squad that travelled to South Africa to participate in the Toyota Challenge against Currie Cup teams Free State Cheetahs, Griquas and Pumas in September–October 2022.

[20] Nash earned his first senior international call-up when he was selected by head coach Andy Farrell in the Ireland squad for the 2022 Autumn Nations Series.

[22] He earned his first senior international cap for Ireland as a replacement in their 33–17 win against Italy in a 2023 Rugby World Cup warm-up match on 5 August 2023.

[25] In February 2025, having not originally been named in the starting lineup to face Scotland , during the 2025 Six Nations, he replaced Mack Hansen, who had withdrawn with a hamstring injury, before scoring the opening try in a 32–18 away victory.