There are 12 Greek players who had an active role in the EL play offs. Highest level of EL basketball. These are the results based on EL play off performance.
Sloukas 27 mins, 15,2 points, 5,7 assists
Calathes 29,5 mins 11,8 points, 4,8 assists
Mitoglou 27,5 mins, 9,8 points
Papanikolaou 23, 5 mins, 10 points
Rogkavopoulos 21 mins, 13.7 points
Walkup 25 mins, 4 points, 4,8 assists
Papagiannis 22 mins, 6,8 points
Dorsey 18,5 mins, 9,6 points, 1 assist
Papapetrou 22,5 mins, 10 points
Kalaitzakis 5 mins, 1,6 points
Larentzakis 7,5 mins, 1,8 points
Kostas 3,5 mins, 1,2 points
I leave out the players who do not have an active role. Either Dorsey or Walkup will not be on the final roster. Since you have game organisers like Calathes and Sloukas, I would go for Dorsey who is a scorer.
So that makes 11 active EL play off players on the Greek NT. Very evenly spread from big men to point guards.
Giannis is the NBA player which will be added should he decide to play. Thanassis is out. That leaves one open spot for someone like Mantzoukas, Toliopoulos, Charalampopoulos, Lountzis.