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Jaylen Brown was injured on a dunk Thursday night at Minnesota.
Jaylen Brown was injured on a dunk Thursday night at Minnesota.Jim Mone/Associated Press

The Celtics announced on Friday that forward Jaylen Brown has been placed in concussion protocol. It is uncertain when he will return to action.

Brown, in his second season, will have to pass a series of tests and then be cleared by an NBA-employed doctor before returning to the court. He was injured Thursday night against Minnesota in a scary fall in which he landed on his back/shoulder/head area after a driving dunk. His hands appeared to slip off the rim.

The frightening scene quieted the crowd at Target Center as Brown remained on the floor for a few minutes before rising to his feet and walking off the court under his own power.

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Brown flew back to Boston with the team and even tweeted he was OK, but had a headache.

The Celtics are no strangers to concussion protocol. Center Al Horford has been through the process twice in the past two seasons and missed nine games last season and two this season with concussions.


Gary Washburn can be reached at gwashburn@globe.com. Follow him on Twitter @GwashburnGlobe.