The Minnesota Vikings appear to be a team that can once again compete for a playoff spot in the NFC. Unfortunately, there's a lot of concern about quarterback Sam Bradford and his lingering knee issue.

Bradford hasn't played since Week 1 against the New Orleans Saints as his knee problems persist. Although it is a major concern for the Vikings, there appears to be no damage in his left knee, according to ESPN.

Tests on Sam Bradford's injured left knee did not reveal any structural damage, and the Vikings now believe the quarterback's status will be week to week, a source told ESPN's Adam Schefter.

Obviously, this is good news for the Vikings. Unfortunately, no real timetable was set for Bradford's return meaning backup quarterback Case Keenum could be under center for Minnesota awhile longer.

When healthy, Bradford seems to play well for the Vikings. Week 1 was a good indication of that with the veteran leading them to victory over the Saints in convincing fashion with a three-touchdown performance.

Although the team would ideally have Bradford under center, Keenum played exceptionally well in Week 3. The Vikings were able to come out on top against a very good Tampa Bay Buccaneers team with Keenum having arguably his best game in the NFL.

The veteran backup threw for 369 yards, three touchdowns, and no interceptions while cruising to the team's second win of the season, 34-17.

Whether Keenum can keep up that kind of production remains to be seen, but Minnesota may have to continue playing him as the starter with Bradford's uncertain status.