NFL responds to Luke Kuechly's surprise retirement at age 28

Newton: Concussions wreaked havoc on Kuechly's career (1:44)

David Newton joins SportsCenter to break down why Luke Kuechly decided to retire now and what it means for Matt Rhule's first year on the job. (1:44)

Luke Kuechly stunned Carolina Panthers fans and players throughout the NFL with the announcement of his retirement on Tuesday night at age 28.

Here's what they were saying:

And one player who recently retired young knows what's coming for Kuechly: