The Minnesota Vikings have some concerns about quarterback Sam Bradford's left knee but remain cautiously optimistic about his status for Sunday's game, a source told ESPN on Friday. Bradford on Tuesday had an MRI on the knee after another source told ESPN that the quarterback had experienced swelling, pain and discomfort following Monday night's victory over the New Orleans Saints. read more http://www.espn.com/nfl/story/_/id/20714003/minnesota-vikings-concern-sam-bradford-knee