When NFL training camps open, it's routine for teams to play multiple players on the various lists that will keep them off the practice field to start things out (PUP, NFI, etc.). A solid chunk of those players are also expected to land on those lists, as they work their way back from injuries last season.
As the Chicago Bears got set to open training camp, they placed star cornerback Jaylon Johnson on the NFI (Non-Football Injury) list. "Non-Football Injury" is broadly classified as any injury suffered away from the team facility, and general manager Ryan Poles said Johnson is expected to miss several weeks of training camp after injuring his leg while training this offseason.