This is a difficult question for me, as my criteria of an international player may be different. I view an international player as someone who was born outside the US and also played overseas professionally. I mentioned Kyrie earlier simply because he was born outside the US and seemed to fit you criteria, but in no way would I consider him an international player.
Based on my criteria, I would vote for Dino Radja.
However, if having no professional international experience is necessary, then I would vote for Al Horford. Although, that would definitely change to Kyrie after this season.