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While the Tennessee Titans will have to part ways with one offensive tackle in free agency, they should strongly consider extending Micheal Roos.
Pros
The Titans need to keep their blindside protected, no matter who is the quarterback of the future. The Titans are facing the potential of having Jadeveon Clowney, Robert Mathis and J.J. Watt all in the same division and finding a quality left tackle in free agency is difficult. If you think that there won't be a market for Roos in 2015, then look at the numbers that Branden Albert and Zach Strief get on the market this year.
If Tennessee can get this deal done, then it will put less stress on them to address OT in the top of the 2014 NFL Draft. If they don't have him re-signed, then he and his agent could have the Titans between a rock and a hard place if he has a great year next year.
Cons
For all his good work, Roos is 31 years old and has seen his fair share of game time in his days for the Titans. While Roos is a very good pass protector, he isn't great as a run blocker and signing him to a long-term deal may not gel with what Ken Whisenhunt is trying to create in Tennessee.
Another issue is, if you are working on extensions shouldn't Casey be first? I understand that Roos will be an easier sell, but it could be perceived as a bad idea to go after a player like that instead of focusing on Casey, especially if Casey leaves in FA next year.
Finally, the Titans should probably just wait and see how he does this season before making a commitment, although it will cost them more money.