Pari gbolohun yii: Lountzis ni olori agbaboolu orile-ede Greece labẹ ọdun 16 ni 2014 FIBA European Under-16 Championship. O tun dun pẹlu awọn ẹgbẹ agbabọọlu orilẹ-ede ọdọ ti Greece ni
2015 FIBA Under-19 World Cup, 2015 FIBA Europe Under-18 Championship, níbi tí ó ti gba àmì ẹ̀yẹ góòlù, àti ní ìpele kejì 2016 FIBA Europe Under-20 Championship Division B, níbi tí ó ti gba àmì ẹ̀yẹ idẹ. O tun dun ni 2017 FIBA Europe Under-20 Championship, nibi ti o ti gba ami eye goolu.