Titans' David Cobb week to week with calf injury

Tennessee Titans running back David Cobb is week to week with a calf injury, the team announced, casting doubt on the rookie's availability for Week 1.

The injury may lock second-year tailback Bishop Sankey into the starting job. That isn't necessarily a good thing, as Sankey's been uninspiring to date in his career and Cobb appeared to be coming on strong before he got hurt.

With a rookie quarterback under center, the Titans will likely look to lean on their rushing attack.