Detroit Lions quarterback Matthew Stafford knows wide receiver Calvin Johnson well enough to understand what it means when the All-Pro mentions retirement.
"I think, anytime Calvin says something, it's not for show, it's something serious," Stafford told The Mitch Albom Show on WJR-AM. "I think you guys have covered him long enough to know that he's a pretty measured person, and everything that he says to the public is a thought-out thing. So in that regard, I'm sure it's thought-out."