Williams, who has 36 catches for 524 yards and five touchdowns on the season, was limited in practice all week. He missed last Sunday's 33-30 victory over the Washington Redskins.
Cowboys safety Gerald Sensabaugh and rookie linebacker Sean Lee, both of whom are recovering from concussions, fully practiced Friday and are probable. Other probables include running backs Marion Barber (calf) and Felix Jones (shin), linebackers Keith Brooking (foot) and Bradie James (knee), and wide receiver Jesse Holley (knee).
The Cardinals listed linebacker Joey Porter as questionable with a tricep injury. Porter was limited in practice Friday after missing sessions Wednesday and Thursday. Linebacker Clark Haggans (groin) also is listed as questionable.
The Associated Press contributed to this report.