The New England Patriots rolled into this season with one of the league's deeper backfields, but depth suddenly is an issue for New England.
Stevan Ridley is officially out for Sunday's tilt with the Cincinnati Bengals. Ridley was not on the field for Friday's practice, according to ESPNBoston.com's Mike Reiss. The team's starting running back hasn't participated all week because of knee and thigh injuries.
Few teams do a better job of rotating runners and leaning on different backs from week to week, so the Patriots should be fine.