Boston Celtics superstar forward Jayson Tatum exited Game 4 against the New York Knicks with an apparent lower-body injury.

Tatum was helped off the court after a Celtics turnover and a Knicks bucket.

Tatum did not return for Game 4, and his status for Game 5 is unclear.

The 27-year-old was diving for a loose ball and immediately grabbed his leg. Tatum was also spotted in a wheelchair on his way to the locker room.

Tatum left the contest with 3:07 remaining in the fourth quarter. Boston called a timeout to get him out of the game.

Tatum undoubtedly had his best game of the series as he recorded 42 points on 16-of-28 shooting from the field, eight rebounds, seven assists and four steals in 40 minutes of action.

The Celtics are now down 3-1 in the series and could be without their best player for the rest of the playoffs.

Head coach Joe Mazzulla said Tatum will undergo an MRI on Tuesday for his lower leg.

In the series, Tatum is averaging 25.0 points per game, 11.8 rebounds, 5.5 assists and 2.8 steals while shooting 40 percent from the field and 37.8 percent from three in four games.

Game 5 is on Wednesday night in Boston.

More Boston Celtics news: Celtics to be Without One Player For Game 4 vs Knicks

Jrue Holiday Addresses Celtics Injury Issues Before Game 4

Celtics’ Kristaps Porzingis Sends Strong Message After Win vs Knicks

Celtics’ Jaylen Brown Isn’t Worried About 0-2 Series Deficit

Celtics’ Joe Mazzulla Offers Strange Comments Following Game 3

Brian Windhorst Offers Grim Assessment of Celtics Gameplan vs Knicks

For more news and notes about the Boston Celtics, head on over to Boston Celtics on SI.

On Monday night, the Boston Celtics will play the New York Knicks at Madison Square Garden for Game 4 of their second-round series.

For the game, the Celtics could remain without one of their key role players, as Sam Hauser is listed as questionable.

Hauser has missed each of the previous two games, so this would be his third straight out of action (if he doesn’t play).

Via John Karalis of Locked on Celtics: “Sam Hauser listed as QUESTIONABLE for Game 4. He had been listed as DOUBTFUL ahead of the last 2 games.”

Hauser is in his fourth year playing for the Celtics.

He finished this past regular season with averages of 8.5 points and 3.2 rebounds per contest while shooting 45.1% from the field and 41.6% from the three-point range in 71 games.

Since the 27-year-old is questionable, it’s very possible that he could end up returning to action.

The Celtics are down 2-1 in the series with the Knicks.

However, they are coming off an impressive 115-93 victory on Saturday afternoon in New York City.

Payton Pritchard led the team with 23 points, four rebounds, two assists and one steal while shooting 8/16 from the field in 35 minutes of playing time.

Following Monday’s game, the teams will return to Boston for Game 5 on Wednesday night.

Whoever wins the series will advance to the Eastern Conference finals and face off against the Indiana Pacers or Cleveland Cavaliers.

The Pacers currently lead the Cavs 3-1 in that series.

CLEVELAND, Ohio — The 3s fell for Boston and so did the New York Knicks.

The Celtics connected on 20 3-pointers Saturday and ran away with Game 3 of the Eastern Conference semifinals with a 115-93 win at Madison Square Garden. Payton Pritchard paced them with 23 points, Jayson Tatum scored 22 — passing Kobe Bryant for the second-most points by a player 27 years old or younger in the playoffs — and Jaylen Brown added 19. Jalen Brunson scored a game-high 27 points for the Knicks.

There was no second-half collapse, wrote Souichi Terada of MassLive, as the Celtics’ lead grew to 31 points. Boston shot 12 of 19 on 3s in the first half and finished 20 of 40. The C’s continued to play their best on the road after a franchise-record 33 victories away from Boston.

MassLive columnist Matt Vautour wondered if the Celtics solved their problems or just simply shot better.

“It was just a matter of time. We’re all professionals. We work really hard on our craft,” Tatum said in Vautour’s column. “We put a lot of time in. You understand there are times when your shot might not be falling, but it always balances out.”

Game 4 is 7:30 p.m. Monday in New York. It will be televised by ESPN. Game 5 will return to Boston on Wednesday.

Here are more storylines and takeaways coming out of that series, opposite the Cavs vs. Pacers in the Eastern Conference:

Celtics showed their poise

With a complete effort, Boston showed its guile and ability to respond in dire circumstances, wrote Boston Globe columnist Gary Washburn.

Mazzulla’s strategic moves

Boston repeatedly put Mitchell Robinson on the free-throw line for New York. The strategy continued into the third quarter with the Celtics up by a considerable margin.

Robinson shot 4 of 12 from the line. He is 7 of 23 in the series.

“Just process over results,” Celtics coach Joe Mazzulla said, as reported by Terada. “You just always stick to the process of what you think gives you the best chance to win on that possession and to win in that game.”

That wasn’t the only thing Mazzulla did.

He hunted mismatch for his talented squad to exploit, namely the defensive deficiencies of Brunson and Karl-Anthony Towns.

“Among Boston’s 24 first half field goals, 14 of those came in possessions that directly involved targeting Brunson and Towns,” wrote MassLive’s Brian Robb. “Some of the attacks involved obvious choices like Tatum staying committed to taking wide-open pull-up 3s against Towns drops in a pick-and-roll.”

Towns also struggled, offensively, making only 5 of 18 shots. He is suffering from a hand injury.

“At one point in Game 3, Towns appeared to say “I broke it,” while speaking to a teammate,” Robb wrote. “However, both Towns and coach Tom Thibodeau played coy after the game when asked about the injury.”

Pritchard shows his playoff value

The NBA’s Sixth Man of the Year showed his worth in Game 3 with a team-high 23 points. Pritchard set a new career high in the playoffs and outscored the Knicks’ bench by himself.

“Just got to maintain my aggressiveness, any chance I get,” Pritchard said in Robb’s report. “Attack the paint, I’ll always be hunting the 3 ball, obviously, but I thought I did a good job of sometimes getting in the paint, making a play.”

Pritchard heeded the call to find his mark, wrote Khari Thompson of the Boston Globe.

Celtics tap into ‘darkness’

The defending champs’ core roster endured heartbreak before last season’s title run, writes Terada for MassLive.

Mazzulla pointed that out after Boston’s Game 3 win in New York, saying, “You’ve got to tap into your darkness.”

“If you plan on doing this for a long time, trust me, it’ll be a lot worse than the last 72 hours,” Mazzulla said in Terada’s report. “And that’s the perspective you have to have. At the end of the day, we have the test in front of us, and I have a group of guys that I wouldn’t want anyone else to be able to go through that. This is the fun part. I didn’t get into the journey for it to be easy. It’s been dark, but in a good way.”

What could a Boston loss mean this offseason

ESPN’s Brian Windhorst writes a series loss for Boston could have significant ramifications on this offseason. According to Windhorst, the Celtics’ continued viability will be in question.

⦁ The team is being sold to a group led by investor Bill Chisholm for more than $6 billion.

⦁ Al Horford is in the final season of his contract and could retire, but Boston is facing payroll and luxury taxes of $464 million.

“If the Celtics don’t make it out of this second-round meeting with the Knicks — and fail to defend their title just as the past five NBA champions have done so — the degree of fallout is uncertain,” Windhorst writes. “Expensive consultants aren’t needed to advise against spending $500 million on a roster that didn’t return to the conference finals.”