With Adrian Peterson (neck) ruled out for Sunday's contest against the Titans, Williams is in line to start at running back, Darren Urban of the Cardinals' official site reports.
Head coach Bruce Arians noted Friday that there isn't a timetable for Peterson's return, meaning Williams has a prime opportunity to contribute for a number of games. In his first chance to start for David Johnson (wrist) in Week 2, Williams put up a measly 22 yards on nine carries. Thereafter, he was an afterthought in the offense -- especially after the addition of Peterson -- but Williams didn't disappoint when called upon this past Sunday, averaging 6.7 yards on his 16 carries. While he could cede some snaps to D.J. Foster and goal-line option Elijhaa Penny this weekend, Williams figures to serve as the Cardinals' primary ballcarrier.