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ORCHARD PARK, N.Y. (AP) _ Left tackle Kris Farris broke his right leg Sunday, further depleting the Buffalo Bills' offensive line.

Farris, starting in place of John Fina, was blocking at the line when running back Travis Henry fell helmet first into the back of Farris' leg. The play happened near the end of the first quarter of Buffalo's 20-3 loss against the Pittsburgh Steelers.

Bills trainers immobilized Farris' leg with an air cast before carting him off the field. As he left, Farris gave a thumbs-up sign to the crowd and yelled ``Go get 'em'' to his teammates.

He was to have surgery Sunday night and could be out for the season.

Jon Carman, coming off the Bills' practice roster a day earlier, took over for Farris in what was an already patchwork offensive line.

Fina is out with a bruised quadriceps and sore right knee. The Bills also were missing starting right tackle Jonas Jennings with a hip injury. Out indefinitely is veteran right guard Jerry Ostroski with a broken right leg. He has been replaced by Corey Hulsey.

The only other active offensive lineman on the depth chart is Craig Heimburger.