Boston Celtics head coach Brad Stevens — not U.S. Democratic Party presidential candidate and South Bend, Ind., mayor lookalike Pete Buttigieg — said on Friday that he is not concerned with Robert Williams’ bursitis.

The 6-foot-8 defensive-minded big man is dealing with inflammation around his hip.

Williams, 22, has not missed any of Boston’s first four games of the season, but he is out against the visiting New York Knicks on Friday evening. He was an instrumental part of the Celtics’ defense against the Knicks last Friday when Boston beat the ‘Bockers in Madison Square Garden.

Enes Kanter, a former Knicks center who was waived by the team last February before playing with the Portland Trail Blazers for the remainder of the 2018-19 season, also remains out as he continues to nurse a knee contusion.

The Celtics, on a three-game winning streak, are thin at center at the moment, although they have 27-year-old German big man Daniel Theis.

Without Williams and Kanter, it’s possible two-way player Tacko Fall — the undrafted UCF product — appears again. Fall checked into the Knicks game last week and scored a bucket with home fans cheering on the opponent due to the tall Fall’s ubiquity.

The Celtics also are missing guard/forward Jaylen Brown, who signed a massive contract extension with the club in October. Going into their matchup with the Knicks, Boston will have to rely on All-Star point guard Kemba Walker along with Jayson Tatum and Gordon Hayward.