The 24-year-old was injured early in the third quarter after a collision with Magic guard Elfrid Payton on a drive to the basket.
"I just bumped knees with Payton," Walker told reporters after Monday's game. "I'm all right, though. A little sore, but I'll be all right."
Walker did not return to the game and finished with 11 points, six rebounds and five assists as he prepares to play in the final year of his rookie contract with the franchise.