EDEN PRAIRIE, Minn. (AP) -- Minnesota Vikings coach Leslie Frazier says long-snapper Cullen Loeffler will miss two to six weeks with a back injury suffered in the loss to Atlanta on Sunday.
Frazier says safety Tyrell Johnson has a "significant" right hamstring injury and receiver Michael Jenkins also is having a knee injury examined. It was not immediately clear which knee Jenkins injured.
Frazier says the Vikings will sign someone to fill in for Loeffler, who broke a bone in his lower back. Jared Allen is the backup, but the team does not want its star pass rusher in the role for the long term.
Frazier also says running back Adrian Peterson's sprained left ankle is improving, but it's too soon to say if he will be ready to play against Denver on Sunday.