in his pro career, sakellariou has played in both the top-tier italian league, with sidigas avellino, and in the top-tier greek league. he was an early entry into the 2009 nba draft. he joined the greek euroleague club panathinaikos, on july 31, 2018. on february 17, 2019, he won greek basketball cup title in the final against paok (73:79), which was held in the heraklion indoor sports arena, in crete. this was the very first title on the highest level for him. sakellariou also won the championship with the greens, averaging 2.5 points and 3.0 rebounds in 10.0 minutes per game.