Nose tackle Ian Williams, whose strong play helped fuel the 49ers’ win over the Eagles on Sunday, was a late addition to the team’s injury report. After practicing Wednesday and Thursday, Williams sat out Friday’s session with an ankle injury.
Williams and four other starters -- Tramaine Brock, Anthony Davis, Vernon Davis and Eric Reid -- are listed as questionable. Vernon Davis said there was a “small chance” he would play against the Chiefs.
Doubtful: C Marcus Martin (knee)
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Questionable: CB Tramaine Brock (toe), T Anthony Davis (knee, ankle), TE Vernon Davis (back), TE Vance McDonald (knee), S Eric Reid (hamstring), DT Ian Williams (ankle)
Probable: S Antoine Bethea (ankle), WR Michael Crabtree (foot), RB Frank Gore (back), DE Tony Jerod-Eddie (shoulder), P Andy Lee (right ankle), DE Justin Smith (not injury related)
Out: WR Donnie Avery (groin), S Eric Berry (ankle)
Questionable: CB Marcus Cooper (knee)
Probable: RB Jamaal Charles (ankle), LB Tamba Hali (knee), CB Sean Smith (groin), RB De'Anthony Thomas (hamstring), LB Frank Zombo (hamstring)