The Celtics have invited former UMass star Stephane Lasme, Southern Indiana's Jamar Smith and LSU's Chris Johnson to training camp, according to sources.
Boston already has 15 players under contract for the 2010-11 season, making it unlikely that any camp invitees will make the regular-season roster.
The Celtics worked out Adam Morrison, Rashad McCants, Cuttino Mobley, and Trenton Hassell this week.