Gordon Hayward underwent surgery to repair a dislocated left ankle and a fractured tibia in Boston on Wednesday night.

Hayward is unlikely to return during the 17-18 season, according to his agent Mark Bartelstein.

"We expect him to make a full recovery and return to his All-Star form," Bartelstein said.

"I was [at the hospital] for a minute last night and also again today for an hour or so. He's down," Brad Stevens said. "Obviously, there's a physical pain to it, but I think it's also doubled by the emotional pain of, you know, he put a lot of effort into trying to start this, his career, out well in Boston.

"But this is a setback; we're expecting a full recovery. And we know there are going to be a lot of tough days ahead on that recovery but, at the same time, hopefully he'll improve day to day. But it's been tough. It's been tough for him."

Hayward signed a four-year, $128 million contract with the Celtics in the offseason.