Ryan Williams News: Head coach Bruce Arians said that Alfonso Smith will be used as the backup to Rashard Mendenhall in some situations, azcardinals.com's Darren Urban reports.

Head coach Bruce Arians said that Alfonso Smith will be used as the backup to Rashard Mendenhall in some situations, azcardinals.com's Darren Urban reports.

Williams is No. 2 on the Cardinals' official depth chart, while Smith is No. 4. However, Smith worked as the top backup during the preseason, and Williams was hardly able to play. It's possible that both backs will have roles behind Mendenhall, though there probably won't be a ton of touches to go around. Looking at Arizona's personnel, a pass-heavy offense will probably be the best approach. Given that he's a co-backup at best this week, Williams makes for a poor fantasy play.