Defensive end Jared Allen insists the Vikings' defensive surge the past two-and-a-half games hasn't required a complicated formula. Since giving up a 30-yard Andrew Luck touchdown pass with 7 seconds left before halftime in Week 2, the Vikings defense has been on the field for 27 possessions yet has allowed just two touchdowns and 32 points.

"Honestly, I think we've just kept it simple," Allen said Thursday. "We've just been playing forward football and physical football. We're really harping on the basics and the fundamentals of what we do and just creating that identity. Nothing special, nothing spectacular. But just playing solid, fundamental football."

The defensive balance has been impressive with significant contributions coming from the defensive line, the linebackers and the secondary.

"Guys are playing well right now," Allen said. "And the young guys are starting to play well. That gives everybody confidence and as that grows, you can start doing more things.

"But when you can line up with your front seven and you can stop the run and get after the quarterback like we did against Detroit, that helps out a lot. You can do more things on the back end coverage-wise."

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    Allen strained a groin late in Sunday's win at Detroit and was did not participate during Wednesday's practice. He may be held out again today as a precaution. But the Vikings' Pro Bowler said he's feeling better. Against San Francisco in Week 3, Allen was hindered by neck spasms, which lingered a bit into last week. "I've never been in the training room this much in my entire career," he said.
  • Here's what Allen had to say about Titans running back Chris Johnson: "He's explosive. And with any good back you face, you have to stop them before they start. You can't let him get into space and think you're going to tackle him. We need to hit him in the backfield. We need to bottle him up. And if you do that, then you can shut him down. But other than that, he has the ability to hit that edge and turn the corner and be gone. So it's something we have to be really conscious of."