The Magic said Wednesday that Lee had a fractured sinus after taking an elbow to the head from teammate Dwight Howard in Game 5 on Tuesday night. Lee's status for the remainder of the playoffs is uncertain.
Howard soared to block a shot by Willie Green in the first quarter and inadvertently came down on his teammate. Lee was taken to a hospital as a precaution.
The Magic lead the Sixers 3-2 in the best-of-seven series. Game 6 is Thursday in Philadelphia.
Orlando could also be without Howard for the game. An NBA spokesman said the league is reviewing another elbow by Howard on the Sixers' Samuel Dalembert that drew a technical foul.