Kammala jumla mai zuwa: Tsalmpouris ya kasance memba na 'yan wasan matasa na Girka. Tare da 'yan wasan matasa na Girka, ya buga wasanni masu zuwa: 2012 FIBA Turai Under-16 Championship, 2014 FIBA Turai Under-18 Championship,
2015 FIBA karkashin-19 gasar cin kofin duniya, 2015 FIBA Turai karkashin-20 Championship, da kuma 2016 FIBA Turai karkashin-20 Championship Division B, inda ya lashe lambar tagulla.