Celtics center Nikola Vucevic is “making progress” in his recovery from finger surgery, according to head coach Joe Mazzulla.

Vucevic fractured the ring finger on his shooting hand on March 6 and has yet to return. The Celtics announced at the time that he would be reevaluated after three to four weeks, meaning the 35-year-old could return for Boston’s final few regular-season games.

“He’s getting better,” Mazzulla said Tuesday. “He’s doing his on-court work, even with his left hand, but he’s getting better and better. I don’t have an exact timeline, but I know he’s making progress in his recovery.”

Vucevic has attended several of the team’s games during his rehab, wearing a large splint/brace on his right hand. He told reporters last week in Memphis that he hoped to be back in the fold before the playoffs.

“The good thing is I can still do some stuff on the court,” Vucevic said, via The Boston Globe. “That will help me for when I come back (to be in) shape, and hopefully I get a couple games before the playoffs, get back in rhythm with the guys that week between regular season and playoffs, every­thing going as smoothly as possible.”

The Celtics acquired Vucevic from Chicago ahead of last month’s NBA trade deadline to back up starting big man Neemias Queta and add a new dimension to their frontcourt. He appeared in 12 games before his injury, averaging 10.4 points and 7.2 rebounds on inconsistent 44.5% shooting (35.1% from 3-point range).

During his absence, Boston has pivoted back to Luka Garza as its No. 2 center. Garza has scored in double figures four times in nine games since Vucevic went down — including a season-best 22-point, seven-rebound outing against the Grizzlies last Friday — and owns the best net rating of any Celtics rotation player during that span.

The Celtics will host the defending champion Oklahoma City Thunder on Wednesday night at TD Garden.