He won't go in first round due to guaranteed money. He will go high in 2nd round due to his talent, and the ability to cut him fast if it doesn't work out. We pick 3rd in 2nd round, after Minnie (like they need another 5!!) and Houston (who drafted Cappella last year).
So I think there is a decent chance Celtics will draft him at 33, if they don't package that pick in a trade.