"Greg Jennings never feared the worst. He never, for a second, thought this could be season-threatening. Teammates may have cringed at the sight of the Green Bay Packers receiver hobbling and hurting four weeks ago.

Jennings wasn't worried.

Even after watching film of the collision that sprained his medial collateral ligament, Jennings was still baffled. He had minor ankle and hamstring injuries before. Those were detectable. This injury had a maddening gray area.

Knee injuries can be funky, mysterious. Back at practice for the first time Wednesday, he says the challenge is all mental. Tight end Jermichael Finley has been there, done that and has advice."