Seko was called up to give his debut for the Japan national team in a friendly against Uzbekistan on 21 January 2022.[6] However, the match was cancelled by the JFA due to COVID restrictions.[7]
In March 2023, he was called up by Hajime Moriyasu for friendlies against Uruguay and Colombia. This time, he was able to make his debut, having played a full match against Uruguay on 24 March 2023, which ended in a 1–1 draw.[8]