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Updated: September 22nd, 2013 5:33pm
Vikings injury updates: Chris Cook, Jamarca Sanford, A.J. Jefferson

Vikings injury updates: Chris Cook, Jamarca Sanford, A.J. Jefferson

by Derek Wetmore
1500ESPN.com
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MINNEAPOLIS -- As training camp rolled around, depth in the secondary was a concern for the Vikings. That lack of depth manifested itself Sunday, as Chris Cook, Jamarca Sanford and A.J. Jefferson left the game with injuries. Jefferson returned in some defensive packages, but Cook and Sanford remained on the sidelines.

Marcus Sherels, Andrew Sendejo and Xavier Rhodes got playing time as a result. Following Sunday's game, there was no immediate update on the availability of the trio of injured players for next week.

"When you get muscle pulls in the secondary, that affects you," head coach Leslie Frazier said. "You don't want to start getting into your depth this early in the season. Losing Jamarca and Chris, and potentially A.J., that's a concern. We'll have to see how they progress through the course of a week."

Cook (groin) has never played a full season in the NFL. His loss was a blow to the cornerbacks, but Marcus Sherels made a couple of impressive open-field tackles and overall played reasonably well. 

"I thought Sherels did a good job -- made some plays, got his hands on some balls, really competed hard, like he always does, and put himself in good position. I thought Marcus did a good job," Frazier said.

Sanford (hamstring) thins the safety position that has already seen reserve safety Mistral Raymond fall from being a starter last season to deactivated each game so far. Sendejo, whom the Vikings recently handed a two-year contract extension, filled in for Sanford in the second half on Sunday.

Jefferson replaced Cook, but tweaked his ankle. He was the only of the three to re-enter the game, when the Vikings needed to use four corners in dime packages on coverage downs. 

Derek Wetmore is the senior editor for 1500ESPN.com. His previous stops include MLB.com and the Minnesota Daily.
Email Derek | @DerekWetmore
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