Hager notched a team-high 10 tackles (five solo), a tackle for loss and a pass defensed in Sunday's 23-16 win over the Browns.
The Jets signed Hager to the active roster Tuesday, Aaron Wilson of the Houston Chronicle reports.
Hager signed with the Raiders on Friday.
The Rams placed Hager (shoulder) on injured reserve Tuesday.
Hager (shoulder) has been ruled out for Sunday's game against the Steelers, Cam DaSilva of USA Today reports.
Coach Sean McVay said Hager (shoulder) will likely be placed on injured reserve.
Hager (shoulder) was ruled out for Sunday's game against the Bengals in London.
Hager (shoulder) is officially inactive for Sunday's matchup against the Falcons, Vincent Bonsignore of The Athletic reports.
Hager is questionable for Sunday's game in Atlanta with a shoulder injury, Adam Caplan of SiriusXM Radio reports.
Hager doesn't have an injury designation ahead of Sunday's matchup with the 49ers.