The Arizona Cardinals were optimistic that they would have veteran running back Adrian Peterson available for last Sunday's tilt against the Los Angeles Rams. However, Peterson still hadn't recovered fully from the neck injury he sustained back in Week 12.

Unfortunately, it seems the pain has lingered into this week, as Peterson is yet to practice. According to Darren Urban of the Cardinals' team website, even head coach Bruce Arians is unsure about the veteran's status moving forward:

“Really just time. Time and doctors,” Arians said.

Arians is understandably, taking a cautionary approach with Peterson's neck. As a result, backup Kerwynn Williams could receive another heavy workload.

The fourth-year back stepped up huge last week in Peterson's absence with 16 carries for 97 yards on a whopping 6.1 yards per carry. Given his success as the primary back against a susceptible Rams run defense, Arizona may be planning to give Williams another heavy dosage this week against the Tennessee Titans.

Although Peterson's injury does not seem too severe given the initial timetable, it has obviously become another hindrance for his body. It will be interesting to see if Arians decides whether or not to let Peterson resume his normal workhorse duties when he finally returns.