From JSO question and answer session with Matt Vensel of the Star Tribune:

Q: It wasn't too long ago that Greg Jennings was catching passes on the Super Bowl stage. Now he's part of a rebuilding franchise. Is he frustrated? Embracing the process? Where's his head at right now?

Vensel: I would love to ask him for you, but he doesn’t make too many appearances in the locker room nowadays. Jennings has been quiet both on and off the field, and any leadership he is providing behind closed doors isn’t enough to compensate for his lack of production as a wide receiver. I thought he might click with Teddy Bridgewater, being the team’s one veteran receiver and all, but too often he has disappeared. It will be interesting to see if the Vikings decided to cut ties with him after the season or if they pay for one more year.
http://www.jsonline.com/blogs/sports/283519311.html