Kelsay partially tore a ligament in his neck in a practice last month. He has missed three of the last four games.
In nine games and four starts this season, Kelsay had 14 tackles, two sacks and a safety.
Heath has spent the first 12 weeks of the season on the Bills’ practice squad. Williams, a sixth-round pick by Pittsburgh in 2011, has been with the practice squad the past five weeks.
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