Rivers was hurt during the Clippers' home game against Minnesota on Wednesday, and the injury was originally diagnosed as a bruise. But when the pain persisted, further exams were performed, and the break was found.
Rivers, the son of Clippers coach Doc Rivers, has averaged 8.1 points in about 22 minutes per game this season.
The Clippers are still without forward Blake Griffin, first because of a torn left quad tendon and now also because of a broken right hand after he punched a team employee in January. The NBA is investigating that circumstances surrounding that incident, and the elder Rivers said Sunday he expects that probe to "be done pretty soon."
This story has been corrected to show that the game was in California, not Minnesota.