Gordon Hayward underwent surgery tonight for his dislocated ankle and broken tibia and is unlikely to return this season, Adrian Wojnarowski of ESPN.com reports.
Wojnarowski added that the Celtics will have better chance at figuring out a timetable for Hayward's return after the surgery.
Celtics coach Brad Stevens said earlier on Wednesday that he wasn't sure when Hayward's surgery would be or what the timetable would be for his recovery.
Before Boston's home opener against the Bucks Wednesday, the Celtics played a video of Hayward after introducing him with the starting lineup.
On Tuesday, Hayward suffered a gruesome injury just five minutes and 15 seconds into Boston's season opener against the Cavaliers.