Celtics center Robert Williams, who came off the bench for Boston as one of the team’s key rotational pieces in the series against the Heat, was playing through a stomach bug on Monday night, according to a report from Shams Charania of The Athletic and Stadium.

“I’m told that Robert Williams was throwing up during the game,” Charania said. “He only played 14 minutes last night. He was coming in and coming out of the game. When he’d come out, he’d throw up. He was dealing with a stomach virus … a stomach bug. He played through it. He was sick yesterday, he’s sick going into today. He only played 14 minutes, so that’s a guy who the Celtics have depended on a lot over the last couple of years.”

Williams played well in his limited action on the floor on Monday, scoring eight points while grabbing six rebounds and adding one block. 

Celtics fans online wondered why he wasn’t getting more playing time considering how well he was playing down low, but now that the details have been released, it makes a lot more sense why he kept coming in and out of the Game 7 loss on Monday.