Here are the steps of the NFL's concussion protocol
Panthers Star Linebacker, Luke Kuechly, Quits NFL at 28 After String of Concussions
Panthers' Luke Kuechly Openly Weeps After Possible Concussion
Luke Kuechly out of concussion protocol, cleared to play Sunday
Kuechly misses practice, remains in concussion protocol
Panthers await word on Kuechly in concussion protocol
Luke Kuechly to miss third straight Carolina Panthers game with concussion, NFL News
Luke Kuechly - ABC11 Raleigh-Durham
Carolina Panthers LB Luke Kuechly ruled out for Sunday, remains in concussion protocol
Luke Kuechly: Poster Child for NFL's Concussion Problem - Sports Illustrated