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Jeff Haynes/Associated Press

Good teams deal with major upheaval from season to season. They churn the bottom of the roster in search of better talent, but the core will generally stay the same through the years.

It appears the Detroit Lions are trying to follow that model.

The draft and free agency didn't bring in a lot of competition for older players. Travis Swanson, 24, will have to beat out 32-year-old Manny Ramirez for the starting center gig, but the second-year player hasn't exactly earned the veteran moniker yet. Plus, even if Swanson doesn't win the job, the coaching staff will continue grooming him for the future.

Therefore, you won't find him on this list. We're looking for those older players who have subtly received messages that their futures aren't secure or those who suddenly have a fight to remain on the roster.