Ku dhammaystiro weedha soo socota: Stamatis wuxuu xubin ka ahaa xulka qaranka ee da'yarta Giriigga. Iyada oo kooxaha qaranka ee da'yarta ee Giriigga, wuxuu ka ciyaaray qaar ka mid ah tartamada soo socda: 2011 FIBA Europe Under-16 Championship, 2012 FIBA Europe Under-16 Championship, 2013 FIBA Europe Under-18 Championship, 2014 FIBA Europe Under-18 Championship. Wuxuu sidoo kale ka ciyaaray
2015 FIBA Under-19 World Cup, 2015 FIBA Europe Under-20 Championship, iyo qeybta 2aad 2016 FIBA Europe Under-20 Championship Division B, halkaas oo uu ku guuleystay billad naxaas ah.