PRO FOOTBALL : DAILY REPORT : RAIDERS : Wilkerson Is Back in Starting Lineup

Bruce Wilkerson moved back into the starting lineup Wednesday, replacing Rory Graves at left tackle. Coach Art Shell declined to elaborate on the reason for the switch.

Plagued by holding penalties last season, Graves was not called for many penalties during the Raiders’ first three exhibition games. He did allow a sack, however, in Monday’s 17-12 exhibition victory over the Dallas Cowboys.

After starting at right tackle in 1988 and ‘89, Wilkerson missed the first half of the 1990 season because of a knee injury. When he returned, he couldn’t get his starting job back from Steve Wright.

Shell, a Hall of Fame left tackle, said it is the most difficult position to master on the offensive line and one of the most vital, since a left tackle is responsible for preventing the quarterback from being blind-sided.

“It’s all in the footwork,” Shell said. “The footwork is different on the left than on the right.”

Center Don Mosebar, who ended a month-long holdout Tuesday, will probably start Saturday’s exhibition game against Chicago Bears. Running back Greg Bell, who sprained an ankle in Monday’s exhibition, probably won’t play against the Bears.