The 49ers don’t play until Sunday, so we’re assuming Shanahan is referencing when we should first expect Williams to take the practice field this week. Williams suffered what was classified as a stinger in Week 3’s win over the Cardinals, but appears to have avoided any serious injury. Shanahan said the team plans to manage he and LB Dre Greenlaw (quad) throughout the week, and didn’t rule out either player playing in Week 4 against the Broncos.