Nyorai kupfuurira kweiyi ndima - Stamatis akanga ari mutezo wezvikwata zvenyika zvechiGiriki zvevaduku. Nemapoka ejunior emunyika yeGreece, akatamba pane mamwe emakwikwi anotevera: 2011 FIBA Europe Under-16 Championship, 2012 FIBA Europe Under-16 Championship, 2013 FIBA Europe Under-18 Championship, 2014 FIBA Europe Under-18 Championship. Akatambawo pa2015 FIBA Under-19 World Cup
, 2015 FIBA Europe Under-20 Championship, uye yechipiri chikamu 2016 FIBA Europe Under-20 Championship Chikamu B, kwaakakunda menduru yebronze.