SANTA CLARA, Calif. -- San Francisco nose tackle Ian Williams is expected to be sidelined for the remainder of the season with a broken left ankle. He was undergoing surgery Monday.
Williams was injured in the first quarter of his first career start during the 49ers' 29-3 loss Sunday night at Seattle. The third-year pro earned the job as the replacement for the departed Isaac Sopoaga with a strong off-season and training camp.
Coach Jim Harbaugh said: "Looks like he's going to be out for the year. Disappointing, and he'll have surgery today."
Veteran Glenn Dorsey will take over the position.