The Vikings placed Peterson (hamstring) on injured reserve Monday.

EDGE Analysis

Peterson was initially diagnosed with cramps after being forced out of Sunday's overtime win over the Panthers, but it appears that he's dealing with a more serious issue. The veteran cornerback will be forced to miss at least three games while on IR, but coach Mike Zimmer hinted that he could end up missing more time by saying "we don't believe" Peterson's injury is season-ending, per Courtney Cronin of ESPN.com.