During the third quarter, Irving collided with Bulls center Nikola Vucevic while going up for a rebound. Irving was hit in the face by Vucevic's elbow.
Irving was on the ground for several minutes -- pulling his jersey up over his eyes -- before being helped to a seated position. He then walked off the court without any assistance and headed back to the locker room.
He is undergoing testing for a possible concussion, sources told ESPN.
Irving scored 13 points in 21 minutes. He was 4-of-10 from the field and had three rebounds and five assists.