Al Horford will miss "at least a few games" after being diagnosed with patellofemoral pain syndrome in his left knee.
"This is one of those things that it just wasn't getting better," Horford said, according to the Celtics' official Twitter account.
Horford has struggled this season and has been dealing with inflammation in his left knee for nearly a month.
"I don't want to have to keep dealing with this and have a question mark game after game," Horford told reporters on Tuesday. "I just have to listen to the training staff and what the doctors are telling me. I've got to buy into that."
Via ESPN