Williams (ankle) is expected to miss Sunday's game against the Steelers due to a sprained ankle, Adam Schefter of ESPN reports.
On Monday, Williams underwent an MRI, which revealed a diagnosis of a sprained ankle. While the injury is expected to sideline him Week 7, the belief is that Williams isn't dealing with a long-term issue. Considering that backup Ronnie Rivers (knee) also is at risk of missing time, though, Los Angeles' backfield depth could be significantly depleted versus Pittsburgh. Rookie sixth-round pick Zach Evans is the only other healthy back currently on the active roster, while veteran journeyman Royce Freeman could be called up from the practice squad.