Cuir crìoch air an abairt a leanas: Bha Stamatis na bhall de sgiobaidhean nàiseanta òigridh na Grèige. Le sgiobaidhean nàiseanta òigridh na Ghrèige, chluich e aig cuid de na turasachd a leanas: 2011 FIBA Europe Under-16 Championship, 2012 FIBA Europe Under-16 Championship, 2013 FIBA Europe Under-18 Championship, 2014 FIBA Europe Under-18 Championship. Chluich e cuideachd aig
2015 FIBA fo-19 Cupa na Cruinne, 2015 FIBA Eòrpa fo-20 Championship, agus an 2mh roinn 2016 FIBA Eòrpa fo-20 Championship Roinn B, far an do bhuannaich e bonn-airgead.