Only seven NFL running backs have piled up more than 250 carries and 1,000 yards in each of the past two seasons.

Two of them — Chris Johnson and Shonn Greene — are now on the same roster.

The Titans hope the 5-foot-11, 226-pound Greene, signed as a free agent, will serve as the perfect complement to the fleet-footed Johnson, calling to mind the heyday of Tennessee’s highly productive Smash-and-Dash duo of Johnson and LenDale White.

But the combination of Johnson and Greene could prove an interesting chemistry challenge as well because each player is used to the workhorse role. Johnson has the sixth-most carries in the league over the past two seasons, and Greene is seventh, just a few carries behind.

Johnson even wondered how the arrangement would work.

“I have never been a big fan of the two-back system, so I don’t know how we plan on using him,” he told The Tennessean on Wednesday. “… I’ll just roll with it.”

Coach Mike Munchak has said that the Titans plan to use Greene in all situations, so the question now: Will there be enough opportunities to keep both men happy, especially considering Johnson has never been one to ask for fewer carries?

“I like the different styles and I think there’s a really good chance that these guys can feed off one another,” ESPN’s Merrill Hoge said. “I think that once they understand the effects of it, I don’t think it’s going to be a problem.