The 28-year-old suffered a fractured tibia and dislocated ankle in his left leg just six minutes into his Boston debut, missing the entire year as the Celtics reached the Eastern Conference Finals.
He required surgery on the fractured leg to stabilise the damaged leg with screws implanted into the bone – but earlier this week the former Utah Jazz man underwent another procedure to remove the screws.
Team doctors say both his leg and ankle are fine but the screws were removed to avoid irritating Hayward’s ankle tendons.
The timetable for his return has been set between six and eight weeks from now, meaning he will be fit and healthy to start next season.
Celtics fans were over the moon after the news broke online, hailing the team as real contenders for the championship next season with a full-fit roster.
“If that squad stays healthy next year they will be a serious problem,” read one comment.
“This season is looking like a blessing in disguise for them all.”
Another wrote: “This is a great procedure for the long term of his career.
“Plates and screws create unnatural stress points when the bone is impacted and can cause different breaks.”
Despite losing Hayward early in the season, the Celtics performed way above expectation to take LeBron James’ Cleveland Cavaliers to seven games in the Eastern Conference Finals.
They were forced to do so without the help of Kyrie Irving too, after the former Cavs man suffered a season-ending knee injury that ruled him out of the postseason.
Boston also announced Australian centre Aron Baynes had successful surgery to repair a nasal fracture he sustained during Game 6 of the conference finals.
He is expected to be back on the court in two to four weeks.