Olynyk got No. 41, which was most productively worn by James Posey as a member of the 2008 NBA championship team; Iverson took No. 37, which has never been worn by a Celtic in an NBA game, according to BasketballReference.com.
"There's not a lot of numbers left, so obviously (there have been) a lot of great players," Iverson said. "No matter what happens here, I'm excited to be a part of it and I'm going to do whatever it takes to be in a Celtics jersey."
Olynyk said playing with Garnett and Pierce would have been a privilege, but joining a team that is in the process of trading away its two biggest stars (along with its coach) creates a chance for meaningful rookie minutes.
"Learning from those guys would be unbelievably exciting," he said. "Hopefully there are opportunities for us."
Olynyk has already made a splash in Boston — with his long hair.
Ainge made several cracks about Olynyk's shoulder-length mane, saying it "looks like a hippie from Eugene, Ore., in 1977." Asked by reporters if there was any thought of cutting back now that he's in the NBA, Olynyk said genially, "We'll definitely have a look at that in the near future."
But co-owner Steve Pagliuca put his foot down: "We're fine with it here at the Celtics," he said with a chuckle.