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The Buffalo Bills added depth to their linebacking corps Wednesday and did some roster shuffling in advance of training camp, which begins on the field on Sunday.

The Bills signed former Pittsburgh backup Stevenson Sylvester and placed Kiko Alonso on the active/non-football injury list. Alonso, the Bills’ starter at weak-side linebacker, was lost for the season to a knee injury earlier this month.

Two other starters, cornerback Leodis McKelvin and left tackle Cordy Glenn, also were placed on lists that will keep them off the field to start training camp. McKelvin was placed on the active-physically unable to perform list, along with rookie linebacker Randell Johnson. It’s a common status for players coming off surgeries. McKelvin had offseason hip surgery and participated in spring work on a limited basis.

Glenn was placed on the active/non-football illness list. So was No. 3 defensive tackle Alan Branch. The nature of their illnesses was not known. Glenn was present for all spring workouts. Branch skipped all of the team’s voluntary offseason conditioning and spring practices. He did participate in the three mandatory minicamp practices in mid-June. Once cleared by the team’s medical staff, players on injury lists can return to practice.

In another move, the Bills released tight end Mike Caussin, who spent last season on injured reserve.

Sylvester entered the NFL as a fifth-round pick of the Pittsburgh Steelers in 2010. The 6-foot-2, 231 pound Utah product appeared in 50 games during his four seasons with Pittsburgh. He was almost exclusively a special teams player his first three years. He played a little less than 10 percent of the snaps on defense last season.

email mgaughan@buffnews.com