Adrian Peterson, who remains a free agent, is eager to prove he's still an elite running back at 33.

"I'm healthy and I'm ready to roll," Peterson said. "If you want someone to help you win a championship and be productive -- be very productive -- you know how to contact me."

Peterson played just three games in 2016 with the Minnesota Vikings because of a torn meniscus in his right knee and 10 games last season with the New Orleans Saints and Arizona Cardinals before a neck injury landed him on injured reserve.