Lengkepan kalimah di handap ieu: Kottas geus jadi anggota timnas junior Yunani. Kalayan timnas junior Yunani, anjeunna maén di 2012 FIBA Éropa U-16 Championship, sareng boh 2013 sareng 2014 FIBA Éropa U-18 Championship. Manéhna ogé maén di
2015 FIBA Under-19 World Cup, 2015 FIBA Europe Under-20 Championship, jeung 2nd division 2016 FIBA Europe Under-20 Championship Division B, di mana manéhna meunangkeun medali perunggu.