Dolphins' Campbell: Lamar Miller's benching not injury related

Miami Dolphins running back Lamar Miller was glued to the bench for the second half of Sunday's loss to the San Diego Chargers, and it had nothing to do with an injury.

Although Miller was working through a quad issue, his benching wasn't injury related. Instead, Miller was stranded on the sidelines because backup Jay Ajayi "was doing a good job," head coach Dan Campbell told reporters following the game.

Miller was careful with his words after the game, but it was obvious he was frustrated with both the benching and his performance (12 yards on nine carries).

Ajayi fared much better during his limited usage, scampering for 27 yards and a touchdown on six touches.