Ainge said on Monday that Irving had a deviated septum. The injury occurred in November when he was hit in the face by teammate Aron Baynes. Irving wore a mask while healing from the facial fracture.
Irving has not played since March because of a knee injury. But his absence on the Boston bench was noted when the Celtics played his former team, the Cleveland Cavaliers.
Ainge joked: ''I don't think he wanted to be seen in public and ruin his movie career.''
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