SB Nation is reporting that Michael Sweetney, Jamal Sampson and Greg Stiemsma have been invited to Celtics training camp.
This is the second go-round with Sweetney. He was a camp invitee back in 2009. I believe he spent the last few years playing in China.
Sampson is a 6-11 big who has played for 5 NBA teams. He spent the last two years in the Philippines and China. Greg Stiemsma is another 6-11 journeyman. You can follow him on Twitter.