Ban him from playing basketball ever again. It is not the fact that he deliberately hit Nikos Zisis. It is the fact that he is refusing to publicly apologise for his act.
Even Zidane apologized for headbutting Materazzi1. And in his defence he was provoked by the Italian. You can read more about “the way of the thug” by the guys at Mundobasket2006
[1] Zidane apologized to the World, not to Materazzi
Managing organized complexity 