Fernández made his senior debut for the Andorra national football team in a 1–0 friendly win over Liechtenstein on 21 March 2018. He has remained in the under-21 set up since, however, notably scoring a brace in a shock 3-3 draw with England in October 2020, securing Andorra under-21s a rare point against a team featuring Premier League players such as Eddie Nketiah and Aaron Ramsdale.Andorra U21s 3-3 England U21s: Eddie Nketiah denied late winner as hosts equalize in stoppage time Sky Sports. 7 October 2020. Retrieved 20 October 2020. On 12 November 2021, he received a red card for elbowing Kamil Glik in the first minute of the match vs Poland, which Andorra went on to lose by a score of 1–4.
