The Vikings on Wednesday placed quarterback Teddy Bridgewater on injured reserve, a day after the third-year pro suffered a dislocated knee in practice.
Minnesota announced it re-signed Brad Sorensen a day after the quarterback was part of the team's mandatory roster reduction from 90 to 75 players.
Sorensen, 28, played quarterback at Southern Utah and was drafted by the Chargers in the seventh round (221st overall) in the 2013 NFL Draft.
Sorensen rejoins a room that includes 15-year veteran Shaun Hill and undrafted rookie Joel Stave. Taylor Heinicke is currently on the non-football injury list.
The California native spent time with the Chargers in 2013, 2014 and 2015, mostly on the practice squad. He also spent a short stint on the Titans practice squad in 2014.
Defensive tackle Scott Crichton and safety Antone Exum, Jr. cleared waivers and will be placed on injured reserve, along with Bridgewater and B.J. DuBose.
The Vikings host the Los Angeles Rams at 7 p.m. Thursday in the preseason finale for both teams.