EDEN PRAIRIE, Minn. - Vikings head coach Mike Zimmer confirmed early Friday afternoon that starter Sam Bradford will be scratched for a second week due to continuing problems with his left knee. Bradford took part in Thursday's workout but he was not seen at Friday's practice.

That means backup Case Keenum will get the nod against Tampa Bay, as he did last Sunday versus Pittsburgh.

ESPN is reporting that Bradford told the Vikings training staff Friday he was feeling "pronounced" pain in his knee, and NFL insider Chris Mortensen says Bradford wants a second opinion on the knee, which he hurt in the season opener against the Saints.

That opinion will likely come from noted surgeon Dr. James Andrews, who did both of Bradford's ACL reconstructions on the same knee.

Sam Bradford was able to practice some Thursday, but his knee is apparently not ready for game action. Multiple reports say he will be scratched against Tampa Bay.