Gordon Hayward will undergo surgery on his fractured left hand in New York on Monday afternoon and a timeline on his return to the Celtics will come after the procedure, his agent, Mark Bartelstein of Priority Sports, told ESPN's Adrian Wojnarowski.
Hayward suffered the injury in Saturday's 135-115 win over the San Antonio Spurs.
The injury came when he collided with Spurs forward LaMarcus Aldridge, who was trying to set a screen from behind that Hayward didn't see coming. Aldridge was called for an offensive foul on the play, and Hayward, whose left arm got caught between his body and Aldridge's, immediately began shaking his hand and went straight to Boston's locker room.