Vikings' Jennings, Cook, Sanford sit out

EDEN PRAIRIE, Minn. -- For most of the season, the majority of the Minnesota Vikings' injuries have been on the defense. But three days after he was nearly shut out against his former team, wide receiver Greg Jennings was unable to get back on the practice field because of a knee injury.

Jennings, who caught just one pass for 9 yards in a 44-31 loss to Green Bay on Sunday, was on the practice field without a helmet in the portion of Wednesday's practice open to the media. He was one of six players who did not participate for the Vikings, joining running back Matt Asiata (shoulder), cornerback Chris Cook (hip), safety Jamarca Sanford (groin), tight end Rhett Ellison (ankle) and defensive tackle Fred Evans (knee).

We'll learn more throughout the week about how severe Jennings' injury is, but the injuries to Cook and Sanford could be an even bigger problem for the Vikings on Sunday. The team is already without safety Harrison Smith, and missing both players would leave the Vikings with four healthy corners (Josh Robinson, Marcus Sherels. A.J. Jefferson and Xavier Rhodes) and three healthy safeties (Andrew Sendejo, Robert Blanton, Mistral Raymond).

For the league's 29th-ranked pass defense, facing the eighth-best pass offense in the league, that sounds like a recipe for disaster.

"With defensive backs when you have muscle issues it’s always a concern because we need them," coach Leslie Frazier said. "I’m hoping they’ll get through this, but muscles in defensive backs or receivers it’s always a concern."