Forward Wally Szczerbiak will miss at least a week because of recurring ankle injuries.
Szczerbiak, who is averaging 16.9 points, has already missed a total of nine games with sprains in each ankle. He was supposed to start for Boston on Wednesday night against Indiana but was a late scratch with swelling in both ankles and knees.
Guard Delonte West also sat out Wednesday with a sore back. Rivers said West will miss a game Friday against Toronto and then be listed as day-to-day.