Celtics center Kristaps Porzingis, who sat out the final 2 1/2 quarters of his team’s Game 1 loss to the New York Knicks with an illness, was upgraded from probable to available ahead of Game 2 on Wednesday.

Asked whether the big man would have a minutes restriction, Boston head coach Joe Mazzulla said: “Whatever gives us the best chance to win, that’s what we’ll do.”

Mazzulla revealed Tuesday that Porzingis’ ailment was connected to the viral illness that sidelined him for nine games in late February and early March.

Porzingis has shot the ball poorly so far in the playoffs, making a team-worst 32.8% of his field goals and 11.8% of his 3-point attempts. He played 13 minutes on Monday night’s 108-105 overtime loss at TD Garden and finished with zero points on 0-for-4 shooting.

“Since he came back, I think he’s been kind of dealing with it on and off, fighting through it, working through it, doing the best that he can,” Mazzulla said Tuesday. “I think it was just too much for him in that game. I didn’t know that was going to happen until I found out about it in that game. But he had been working through it since he got back, and he’s done a great job of being available. It was just tough for him to continue (Monday), so we’ll see kind of how he handles that.”

Sam Hauser was downgraded from doubtful to out for Wednesday’s game as he recovered from the ankle sprain that knocked him out of Game. The bench sharpshooter also has been quiet this postseason, totaling 16 points (the fewest of any rotation player) over six games. Mazzulla kept him on the bench until the third quarter Monday night.

Hauser did some light on-court work at Wednesday’s morning shootaround but mostly stayed stationary while reporters were present. He and Porzingis were the Celtics’ two most efficient 3-point shooters during the regular season, converting at 41.6% and 41.2%, respectively.