According to the Detroit Lions, they have placed DT John Atkins, LB Austin Bryant, DT P.J. Johnson, and T Ryan Pope on the Active/Non-Football Injury list.
https://twitter.com/Lions/status/1152255296271802368
In case you were wondering, the Active/Non-Football Injury list is the same as the PUP list, but is for players who are not able to practice due to conditions not related to football, or for injuries which did not happen during a game or during practice.