Kam Chancellor appears to confirm that he will retire from the NFL in a message on Twitter.

“I’ve played through all types of bruises and injuries at a high level, but this one I just can’t ignore,” Chancellor wrote in a long tweet.

“To walk away from the game by choice is one thing, but to walk away from the game because of the risk of paralysis is another,” Chancellor wrote. “My final test showed no healing.”

Chancellor was referring to the neck injury he suffered last November.

Chancellor was a four-time Pro Bowler at safety.