Kelly was pressed into duty all around the diamond this season, including pitcher and catcher, and was instrumental in Detroit winning the American League Central Division.
Davis is filling a similar role in his first season with the Lions.
In Thursday's 27-15 loss to Green Bay, Davis handled his normal duties as a backup receiver and key special teams player, but when injuries to Detroit's secondary began multiplying, Davis finished the game at cornerback.
"I guess I'm a utility guy like in baseball," Davis said. "I'm always prepared for whatever they ask me to do. That's my job. I consider myself a football player, not just a receiver."
It isn't like Davis is a complete stranger to playing in the secondary. He was a backup cornerback with Chicago when he was a rookie in 2005.
"It's not that far of a stretch," Davis said. "I just haven't done it since 2005. I'll do whatever it takes to help the team win a game. That's just who I am. But to go out there on my first play and have to cover Greg Jennings -- it was intimidating at first but I said to myself, 'forget it. I've just got to play.
"It's not the ideal situation to go in and play corner when you haven't played it in a while. I tried to hold my own. I wasn't asked to do a whole lot other than cover. I'm a pretty good athlete so I figure I can do a pretty good job of it."
Coach Jim Schwartz gave Davis the word at halftime that he might be pressed into duty on defense.
"We had guys dropping like flies out there," Davis said. "I was ready. I wanted to do it. Some of the stuff came back, all the old rules and things. (Packers quarterback) Aaron Rodgers was nice to me. He didn't pick on me too much."
Davis made two tackles in his brief stint on defense.
His biggest disappointment was that the Lions weren't able to send their Thanksgiving Day fans home happy.
"Green Bay's a good team, but I wish we hadn't beaten ourselves," he said. "We hurt ourselves. Championship teams don't do that."