J.J. McCarthy landed in the NFL's concussion protocol last week, months after Sam Darnold left Minnesota for Seattle.

The fallout from both of those situations will have a direct impact on Sunday's matchup between the Darnold-less Vikings and Darnold-led Seahawks .

On back-to-back fourth quarter plays last week in Green Bay, McCarthy twice had his head slam into the ground -- the first when he was tackled by Packers linebacker Isaiah McDuffie , and then on the next play when he was chased and tackled by Green Bay defensive end Kingsley Enagbare .

McCarthy self reported his symptoms on the flight back to Minnesota from Green Bay, and then found himself in concussion protocol, where he now remains, sources told ESPN.

With McCarthy out, the Vikings will start undrafted rookie

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