Seattle Seahawks strong safety Kam Chancellor, a Pro Bowler and team captain who has been the heart of the Hawks, might have just announced his retirement, ESPN is reporting.

While the 30-year-old, eight-year NFL veteran never used the word "retire," he posted a tweet today (Sunday) saying a neck injury leaves him at risk of paralysis, and that "God has given me a sign that I just can't ignore."

Chancellor, who has played his entire pro career in Seattle, has recorded 606 tackles,  12 interceptions, nine forced fumbles and 44 pass deflections. He played quarterback during his high school years in Virginia, and worked out as a quarterback at Virginia Tech before moving to the defensive backfield.

With Seattle free safety Earl Thomas in negotiations with the Dallas Cowboys, Chancellor's loss would be a harsh blow for the Seahawks' defense.