Leonard accidently struck Ibaka with his elbow while the players were jumping for a rebound, causing the big man to immediately grasp at his forehead. Ibaka, who began to bleed profusely, headed to the locker room for more medical assistance.
League sources told The Athletic that Ibaka received three stitches for the cut on his head. He eventually returned to the game in the second quarter with a large bandage over the stitches.
Ibaka had 10 points and two rebounds in 22 minutes off the bench in the Raptors' 125-89 drubbing of the 76ers at Scotiabank Arena in Toronto.
The Raptors hold a 3-2 series lead after their victory. Game 6 is Thursday night at the Wells Fargo Center in Philadelphia.