Daniel Theis ruled out vs. Bulls

While the Celtics bring a center back from the injury list, they will also be without their starting big man for Monday’s tilt with the Chicago Bulls.

Daniel Theis has been ruled out of the contest versus the Bulls due right knee soreness, while Vincent Poirier will make his return since being sidelined since Dec. 17 due to a broken finger.

Theis has popped up on the injury report with knee soreness recently, but it hasn’t withheld him from game action until now. Theis, who has missed only three games due to other ailments this season, played just 15 minutes, the least amount of any of the Celtics’ starters, in Saturday’s 140-105 win over the New Orleans Pelicans.

According to Celtics coach Brad Stevens, the soreness Theis is experiencing in his knee is due to tendinitis.

The 6-foot-8 Theis has been a valuable contributor for the C’s, starting 33 games while averaging 7.4 points, 6.0 rebounds and 1.4 blocks.