The Lions activated McKinley (undisclosed) from the non-football injury list Thursday, NFL reporter Aaron Wilson reports.
McKinley only spent a handful of days on the NFI list, and he'll now be able to rejoin teammates at training camp. The undrafted rookie compiled 42 catches for 717 yards and three touchdowns in his senior season at Notre Dame.
McKinley (undisclosed) was placed on the non-football injury list Sunday.
The 23-year-old signed with the Lions as a UDFA in the spring, and the specifics of his injury remain unclear. McKinley can't miss too much time to maintain a chance of making Detroit's season-opening roster.