What is confirmed
The team called it a head injury and ruled him out for the rest of the game. That came quickly. Concepcion did not get a questionable tag first, which is usually a sign the medical staff saw enough to end his day right away.
Cleveland had scored to cut the Jets' lead to 7-3 around the time the update came out, per ProFootballTalk.
What is reported
Beat writers covering the game, including Mary Kay Cabot of the Cleveland Plain Dealer, said the injury followed a hard hit from Jets safety Minkah Fitzpatrick. The Browns have not said whether Concepcion entered the concussion protocol. If he did, he cannot return to practice or games until he clears each step with team doctors and an independent neurological consultant.
There is no timeline yet, and there will not be one until the team speaks after the game or early in the week.
Why it matters for RSO rosters
Concepcion is a young, cheap receiver on a rookie contract, which is exactly the kind of asset RSO owners should be slow to give up on. A head injury in Week 6 does not change his long-term value. It does make his Week 7 availability a real question.