Kyrie Irving will miss three to six weeks after undergoing surgery to remove a tension wire in his left knee.
Irving could return as early as Boston's first round series.
"The wire was originally placed as part of the surgical repair of a fractured patella sustained during the 2015 NBA Finals," the Celtics said in a release. "While removal of the wire should relieve irritation it was causing in Irving's patellar tendon, the fractured patella has fully healed and Irving's knee has been found to be completely structurally sound."
Irving sought second opinions this week after soreness in his left knee failed to dissipate with extended rest.