The Lions signed Reader (quadriceps) to a two-year deal Thursday, Tom Pelissero of NFL Network reports.
Reader (quadriceps) was placed on injured reserve Monday.
Reader will miss the remainder of the season due to a torn quadriceps, Ben Baby of ESPN.com reports.
Reader's quadriceps injury, which he suffered during the Bengals' game against the Vikings on Saturday, is potentially serious, Ian Rapoport of NFL Network reports.
Reader has a right knee injury and will not return to Saturday's game against the Vikings.
Reader (back) is active for Sunday's game against the Colts.
Reader (back) is listed as questionable ahead of Sunday's game against the Colts, Paul Dehner Jr. of The Athletic reports.
Reader (personal) returned to practice Friday, Geoff Hobson of the Bengals' official site reports.
Reader (knee) was activated off of injured reserve Saturday.
Bengals head coach Zac Taylor said Friday that Reader (knee) will play Sunday against the Steelers, Geoff Hobson of the Bengals' official site reports.