The Jacksonville Jaguars think they have their running back of the future in T.J. Yeldon. Depth behind him though, remains a question.

Jaguars general manager David Caldwell told reporters on Tuesday the team will work this offseason to identify a dependable backup to the rookie starter.

"It's important just for a longevity standpoint," Caldwell said, via the Florida Times-Union. "I think every team, you need more than one back, and we'll do our due diligence to find him one."

Yeldon missed four games with injures this season, including the last three due to a sprained knee. The second-round pick out of Alabama ran for 740 yards and two touchdowns, but without him in the lineup, the Jacksonville running game struggled.

Whether the second back Caldwell is looking for is currently on the roster remains to be seen.

Denard Robinson ran for 266 yards over 13 games, but fumbled three times. Veteran Jonas Gray was signed off the Miami Dolphins practice squad late in the year and ran 14 times for 54 yards over the final two weeks of the season. Toby Gerhart once again failed to make an impact before a sports hernia ended his season in early December. His salary, combined with his injury history, may put his roster spot in jeopardy moving forward.