Sylvester missed the past two practices at training camp because of a knee injury.
The Bills signed the fifth-year player just before the start of camp in mid-July. The signing was made a few weeks after starter Kiko Alonso was lost for the season with a torn left knee ligament.
Sylvester was selected by Pittsburgh in the fifth round of the 2010 draft. He split time at linebacker and special teams in appearing in 50 games over the past four seasons with the Steelers.
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