Orlando center Glen Davis left the Magic's game against Cleveland in the first quarter with a sprained right knee and is doubtful to return.
Davis, averaging 8.9 points and 5.4 rebounds, has started the last four games in place of Magic star Dwight Howard, who is out indefinitely with a herniated disk in his back.
Davis was injured Sunday when he went up for a shot and came down awkwardly on the leg. He crumpled to the floor and was down for a couple of minutes.
Davis walked to the locker room with a noticeable limp and will undergo further examination on Monday.
The injury is just the latest setback for the Magic. Coach Stan Van Gundy said before the game he's preparing to play the rest of the season without Howard and Hedo Turkoglu, who is sidelined with a facial fracture.