The Clippers said Crawford's injury stems from the strained left calf that forced the shooting guard to miss eight of nine games over a two-week period in March.
"It's a concern, though," Rivers said. "Every time he plays two games it seems like since he's been back, it's sore again. We're going to talk about that probably in the next couple of days."
Crawford, who is third on the team in scoring (18.6 points per game), has played in the last five games since he sat out with the calf injury.
He came out of Saturday's win over the