 Guzmics was selected for Hungary's Euro 2016 squad.On 14 June 2016, Guzmics played in the first group match in a 2–0 victory over Austria at the UEFA Euro 2016 Group F match at Nouveau Stade de Bordeaux, Bordeaux, France.Three days later on 18 June 2016 he played in a 1–1 draw against Iceland at the Stade Vélodrome, Marseille.