I think it is  confirmed. I don't think the injury is so bad but the bucks won't let him (I can't blame them) 
@ somebody at draft time I wanted the Cs to draft him. I have watched him  play since he was 16. I don't remember if I posted that here but he was one of the players I consider more likely to become a good player then Bender. But I still think he was drafted too high. Of course that is relative to the rest of the crop but if Papagiannis is a lottery pick then Charampopoulos should go top 3... Anyway I am a happy for the kid and I hope he makes it over there  
Giannis Update : the Greek Basketball Federation claims that the Bucks forced him to withdraw.They don't have any credibility but i think they are right