The Rams activated Johnson (shoulder) from IR on Tuesday.
Johnson (shoulder) was placed on injured reserve Wednesday.
Johnson is set to miss four to six weeks after sustaining a shoulder injury during Sunday's loss to the Cardinals, Jordan Schultz of BleacherReport.com reports.
Johnson suffered a shoulder injury during Sunday's game against the Cardinals and is questionable to return, Jourdan Rodrigue of The Athletic reports.
Johnson recorded six tackles (two solo), an interception and a pass defended during Sunday's 26-20 overtime loss to the Lions.
The Rams announced Thursday that Johnson has agreed to re-sign with the team.
Johnson recorded three tackles (two solo), an interception and a pass defended during Sunday's 28-20 victory against the Commanders.
Johnson registered six tackles (one solo), two pass deflections and an interception during the Rams' 36-19 win over Cleveland on Sunday.
Browns general manager Andrew Berry said Tuesday that Johnson will be released, Tom Withers of the Associated Press reports.
Johnson recorded five tackles in a 28-14 loss to the Steelers in Week 18.