The Broncos also announced that linebacker Derrek Tuszka has been placed on the list due to a hamstring injury. Tuszka, a seventh-round pick this year, had three tackles in five games.
Purcell had 15 tackles and a sack while appearing in six games.
The Broncos filled one of the roster spots by signing defensive tackle Sylvester Williams off of the practice squad. The 2013 first-round pick returned to Denver’s practice squad this month and he played seven defensive snaps against the Patriots in Week 7.