Chicago Bulls forward Luol Deng and backup guard Eric Piatkowski were placed on the inactive list before Saturday's game against Philadelphia after a collision during the morning shootaround left both players with concussions.

Piatkowski also had a laceration that required "at least 15, maybe almost 20 stitches" in the forehead, coach Scott Skiles said. Both players are day-to-day.

"It was a freak accident that I had never seen before," Skiles said. "We were doing offense at two different ends, two different teams. Both teams threw the ball at the same time in the backcourt, while both players went for it."