Boston Celtics guard Kemba Walker will miss time at the start of the season after receiving a stem-cell injection in his left knee, the team announced Tuesday morning.

Per the Celtics, Walker consulted with multiple specialists before settling on a treatment in early October. His timeline for a return was 12 weeks, and he will be re-evaluated in early January. The NBA season is scheduled to open on Dec. 22, so Walker will miss time and then could be limited afterward as the Celtics try to tend to his knee as best they can.

Walker struggled with knee issues all year, playing in just 56 of Bostons regular-season games. He appeared limited at times when the season resumed in the Disney World bubble as well, despite a four-month layoff.

Walker, who is 30, signed a four-year, $140 million contract with the Celtics in 2019.

Per the Celtics, second-year wing Romeo Langford will also miss time. He had a procedure to repair a torn scapholunate ligament in his right wrist in September and was expected to miss four-to-five months. Per the Celtics, his recovery is proceeding on schedule.

Tristan Thompson also suffered a minor hamstring strain and will for the first week of training camp.

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Boston Celtics Kemba Walker will miss time after stem cell injection in left knee, will be re-evaluated in J - MassLive.com