Nnamdi Asomugha went down with a high ankle sprain injury against the Seahawks and when he returned last week against the Dolphins after three weeks of rest he clearly wasn’t himself. Now it appears his ankle is worse than previously believed or got worse during the game on Sunday. Asomugha could miss more time. Chris Johnson was also out with a groin injury and could also miss this week’s game in San Diego. That leaves Stanford Routt and rookies Jeremy Ware and Walter McFadden as the only healthy cornerbacks. Jeremy Ware drew poor reviews from the coaching staff in Pittsburgh and was inactive last week. Walter McFadden was active and had a rough day against Miami. Both will be relied upon against the second best passing team in football. When the Raiders defeated the Chargers in Oakland, Philip Rivers threw for 431 yards and two touchdowns. He was unstoppable against the Raiders secondary, which included Asomugha and Johnson. Michael Huff will likely see additional snaps at corn