Boston Celtics All-Star guard Jaylen Brown will miss the remainder of the NBA season due to a wrist injury.

In a major blow for the playoff-chasing Celtics, Brown was diagnosed with a torn scapholunate ligament in his left wrist, the team announced on Monday.

Brown is expected to have surgery on the torn ligament later this week, while there is no timetable for a return.

The 24-year-old had already missed the past three games with a sprained left ankle.

Brown had been enjoying a career season for the Celtics, resulting in his first All-Star selection.

In 2020-21, Brown was averaging career highs for points (24.7), assists (3.4), field-goal percentage (48.4) and three-point percentage (39.7), while he also averaged 6.0 rebounds per game.

Brown's injury comes with Boston's season in the balance.

The Celtics (35-33) are seventh in the Eastern Conference – enough for a play-in tournament berth – though Boston are in danger of missing the postseason altogether.