Sam Bradford‘s knee could be a real problem. The Vikings quarterback is not expected to play on Sunday, according to Dan Graziano of (Twitter link). The Vikings’ plan was to have Bradford practice this week and see how his knee responded to treatment. He found himself pretty limited and the Vikings are apparently going to shelve him for this weekend. It’s not clear what their plan is for Bradford beyond this week. Last week, the Case Keenum-led Vikings lost badly to the Steelers and they could have another uphill battle against Tampa Bay.