Williams (hamstring) is set to play Sunday against Arizona, Tommy Yarrish of the Cowboys' official site reports.
Williams was limited in practice during the first two days of Week 8 prep, but he upgraded to full participation Friday. Consequently, he wasn't given a designation for Sunday's matchup. Williams will be looking to sack the quarterback for a third straight game, and Arizona is tied for 16th in the league with 15 sacks allowed so far.