The Vikings made a flurry of roster moves on Wednesday, officially placing receiver Justin Jefferson on injured reserve and bringing back quarterback Sean Mannion.

Quarterback Nick Mullens, Kirk Cousins' backup, also went on injured reserve with a back injury and like Jefferson will miss at least four games.

Coach Kevin O'Connell said Mullens' injury that won't require surgery and should allow him to return this season.

In the meantime, rookie Jaren Hall will be prepared as Cousins' backup. The team signed Mannion, a former Viking, to the practice squad. Mannion backed up Cousins from 2019-21 and was released by O'Connell before last season. Tanner Morgan, the former Gophers QB who had been added to the practice squad last week, was released on Tuesday.

Cousins hasn't missed a game due to injury in his 12-year career.

"You do kind of get to a point where [backup quarterback] is kind of one of the last things you think about or worry about," O'Connell said. "But I think it's my job to be prepared for those moments."

In other moves Wednesday, the Vikings moved receivers Trishton Jackson and N'Keal Harry to the active roster, and signed former Vikings receiver Dan Chisena and tight end Troy Fumagalli to the practice squad.

Chisena was useful on special teams from 2020-22. Fumagalli played 19 games for the Broncos from 2019-20 but hasn't appeared in a game since.