Chicago's Gibson goes down with ankle injury
Gibson clutched his ankle and grimaced in pain before he was helped off the court. There was no immediate word on his condition from the team.
The 6-foot-9 forward was averaging 12.9 points and 5.9 rebounds going into the game.
Chicago was also without starting guard Kirk Hinrich, who left Thursday night's 103-88 loss to the Sacramento Kings with a chest contusion. X-Rays were negative, but coach Tom Thibodeau said before the game that Hinrich was day-to-day.