Chris Johnson isn't happy that he might have to share carries in the Tennessee Titans' backfield this season.

The running back told The (Nashville) Tennessean that he was unsure why the Titans signed Shonn Greene in free agency. Johnson said Greene's three-year, $10 million contract indicates he was signed to do more than just be used in short-yardage situations.

"I have never been a big fan of the two-back system, so I don't know how we plan on using him," Johnson told the newspaper. "I'm not afraid of competition, but I was thinking we'd maybe get a draft pick for the other back. And you don't give a guy that kind of money to be just a goal-line guy and in tough-yardage situations. So we'll see what happens."

Johnson has stated that his goal for the upcoming season is to once again break the 2,000-yard barrier and make a run at Eric Dickerson's rushing record. That will be difficult if Greene takes away some of his carries.

He said he'll "just roll with it" and that he's OK if it means he doesn't have to carry the ball 30 to 40 times per game. But Johnson made it clear that he believes he's still the No. 1 back.

"And I don't mind a guy getting a carry or two. But if I am the main guy and it is supposed to be my team ... it shouldn't be an issue," he told the newspaper.

At the league's owners meetings this week, however, coach Mike Munchak said he expected Greene to get plenty of work.

"We feel he can play all three downs," Munchak said. "He may get a series where he gets going, we're taking over the line of scrimmage, we want that type of runner in there, and we'll leave him in there. He gives us some more options."

When he was introduced by the Titans last week, Greene, who played the first four seasons of his career with the New York Jets, said he knows this is Johnson's backfield.