In 2012, Stamatis played at the Jordan Brand Classic International game.

After playing basketball with the youth teams of AGOG Evriali, Stamatis began his pro career in 2013, with the Greek League club Panionios.

[2] In November 2015, Stamatis joined Nea Kifissia of the Greek Basket League.

He signed with Aris Thessaloniki of the Greek Basket League on September 24, 2020.

In 18 games, he averaged 6.9 points, 1.6 rebounds and 2.5 assists, playing around 24 minutes per contest.