Bradford out for 2nd straight game, will reportedly seek new opinion on knee

Sam Bradford has been ruled out of Sunday's game against the Tampa Bay Buccaneers, head coach Mike Zimmer announced Friday.

The quarterback's injured knee didn't respond well during the week's practices, a source told ESPN's Dan Graziano.

Case Keenum will presumably start again for the Minnesota Vikings after filling in for Bradford in Week 2.

Bradford will also seek a second opinion on his surgically-repaired knee from renowned orthopedic surgeon Dr. James Andrews, sources told ESPN's Chris Mortensen. Andrews has performed both of Bradford's ACL surgeries, one in 2013 and one in 2014.

Under Keenum's guidance, the Vikings put up just nine points in a loss to the Pittsburgh Steelers - a steep drop-off from the dominant display Bradford and Co. put together in the season opener.

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