Kammala jumla mai zuwa: Gunter ya kasance dan wasan Wales na kasa da kasa tun daga matakin 17 kuma yana riƙe da rikodin a matsayin dan wasa na biyu mafi ƙanƙanta na tawagar 'yan kasa da shekaru 21. Ya fara wasan farko na kasa da kasa a shekarar 2007. Ya kasance wani ɓangare na tawagar Wales wanda ya kai wasan kusa da na karshe a UEFA Euro 2016, kuma ya fito a
Gasar cin kofin Turai ta 2020. A shekara ta 2017 an kira shi Welsh Footballer na Shekara. Ya doke rikodin Neville Southall na wasanni 92 a shekarar 2018, kuma a shekarar 2021 ya zama Welshman na farko da ya samu wasanni 100.