"The Buffalo Bills' depth in the defensive backfield will be put to the test starting Sunday against Oakland.

Cornerback Terrence McGee's hamstring injury is "not good," according to coach Chan Gailey, and will keep him out of the lineup for at least a few weeks.

That means Drayton Florence and Leodis McKelvin are the starters, and rookie second-round draft pick Aaron Williams will see a lot more time on the field when the Bills go to their nickel or dime packages.

Williams got a passing grade from coach Chan Gailey after his first game.

"He did OK. The problem with that, with his situation in the game, was he didn't get many reps during the week," Gailey said. "He made a mistake I think on all of the first three plays he was in there. Then he settled down and played a lot better as the game went on. He'll be just fine. ... I think he's going to be a good player for us.""