Jamison was fouled while taking a shot Sunday. He immediately left the court and was taken to the locker room. Jamison was replaced by Ryan Hollins, who shot the free throws.
Coach Byron Scott doesn't know how long Jamison will be out.
"We'll have a little bit more of an understanding on what's going to happen in the next day or so," Scott said.
Jamison scored 16 points in 30 minutes of Sunday's 95-91 loss. He is Cleveland's leading scorer, averaging 18.1 points.
Information from The Associated Press was used in this report.