Mettenberger was released by the San Diego Charger on Tuesday.
Mettenberger played at LSU from 2011-2013.
He will be reunited with OC Ken Whisenhunt.
Mettenberger has spent his first two NFL seasons in Tennessee.
The Titans selected Mettenberger in 6th round of the 2014 NFL Draft.
Will the Titans be trading the former LSU QB soon?
Go get'em, buddy.
Update: Mettenberger wants to compete with Marcus Mariota for the starting job.
Mettenberger missed the Titans final three games last season with an injury.
He has throw for 1412 yards with 8 TDs & 7 INTs this season.
"He's had better in practices at LSU."
Mettshow looked good on Monday Night Football.
I like it. Wait, no I don't.
Once a Tiger, always a Tiger...
Show'em what you got, Zach.
I think he's done with selfies.
Whatever you are doing Zach.... keep doing it.
Let the Mettshow begin.
The incident involved an Alabama fan.
Thinking maybe this is an NCAA violation of some sort.
2018 Florida RB Chris Curry Commits To LSU
Boom! Welcome aboard Chris!
Video: 'Fuddy Duddy' Paul Mainieri 'Caved In' On LSU Players & Their Hair
Here's what coach Mainieri had to say about the new LSU hair styles.
The Tigers Stay Alive, Beat Oregon State 3-1
LSU snapped OSU's 23-game win streak.
Video: Zack Hess Talks About His 'Rick Vaughn' Haircut, Poche's Performance
"My nickname is psycho."
Caroline Wozniacki Vs. Unicorn Inner Tube During SI Swimsuit Shoot
Wish I was that unicorn.
Finally, Golfer Paige Spiranac In Bikini Poolside
Worth the wait.
SI Swimsuit Model Marissa Miller Hits The Virgin Islands
Where you been, girl?
Former Ole Miss QB Bo Wallace Looking Rough In His DUI Mugshot
Fell asleep at the wheel.