They are still waiting for a second opinion after he suffered a torn tendon in his right thumb, but his chances of a return don't look great.
Fans around Boston got some troubling news on Monday when the team announced that Marcus Smart would be out indefinitely with a hand injury.
Irving will likely have to deal with the lingering soreness for the rest of the season, making Smart's absence that much more painful, with the only healthy bodies of Terry Rozier and Shane Larkin available to play the point guard position. Wojnarowski reports that the Celtics believe it is nothing more than knee tendonitis and that Irving is day-to-day and won't need to miss much time.
"Sore, but it will be all right", Smart told reporters after the game. Smart scored 20 points with eight assists, seven rebounds and four steals against the Pacers on Sunday (Monday, PHL time).
Theis was averaging 5.3 points and 4.4 rebounds in 63 games this season, playing behind Al Horford and Greg Monroe.
The 21-year-old, who played his collegiate basketball at Vanderbilt, was originally selected by the Memphis Grizzlies in the first round (17th pick overall) of the 2016 NBA Draft.