According to the Detroit Lions, they have placed wide receiver Chris Lacy on the Physically Unable to Perform (PUP) list.
https://twitter.com/Lions/status/1152255406212866050
The announcement came just moments after they revealed that 4 players have been placed on the Active/Non-Football injury list.
The PUP list is designated for players who suffered football-related injuries during the postseason. They are still able to participate in all meeting and use the facility, but they may not practice at all with the team.