Marion Barber, Desmond Clark hurt

NASHVILLE, Tenn. -- Chicago Bears running back Marion Barber suffered a left calf injury and was ruled out for the remainder of his team's 14-13 loss to the Tennessee Titans.

Tight end Desmond Clark also suffered an injury, hurting his left knee in the third quarter and leaving on a cart. The injury isn't expected to be a season-ender, according to an NFL source. Clark also indicated the knee injury wasn't as bad as it appeared to be, posting on Twitter that he's confident he will return soon.

Barber, the second back to enter the game Saturday night after starter Matt Forte, carried the ball one time in the first quarter for 2 yards.

The former Pro Bowler signed a two-year contract with the Bears after spending the previous six years with the Dallas Cowboys. The veteran had put together an impressive camp up to this point, and was expected to enter the regular season as the No. 2 running back on the Bears' depth chart.

Veteran Chester Taylor and third-year rusher Kahlil Bell are the other two players competing for spots in the Bears' backfield.

Jeff Dickerson covers the Bears for ESPNChicago.com and ESPN 1000. Information from The Associated Press was used in this report.