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SANTA CLARA -- Starting nose tackle Glenn Dorsey played slightly more than 40 percent of the 49ers’ defensive snaps last season. The nose tackle is the first player to leave the field when the opposing offense goes with a third wide receiver.
Ian Williams, who opened last season as the starter before sustaining a fractured lower leg in the second game of the season, continues to rehab and get into shape for the season. It’s not known when he will be available.
In addition to Williams, who remains on the physically-unable-to-perform list, the 49ers can turn to Quinton Dial, Tony Jerod-Eddie and Demarcus Dobbs, among others, Jim Harbaugh said last week.
Dial (6 foot 5, 318 pounds) has gotten off to a very impressive start to his first training camp after missing most of last season with a toe injury. Dial has been working at the defensive end spots, but Harbaugh said before Dorsey's injury that Dial is capable of playing the nose.
"I think he can,” Harbaugh said. “Tony Jerod Eddie plays that nose and that end at a very high level as well. They (Dobbs, included) keep improving and improving as football players. They arrived last year, no question about it and you see elevation again this year. Both of those players have been and continue to be ascending players."