Both were questionable leading into last week's win over Philadelphia, but played after coming in with different injuries. Anthony was coming off a hamstring strain that kept him out of the previous three weeks. Vernon had an ankle injury that sideline him in the loss to Arizona.
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This week, Anthony Davis has a knee/ankle injury. Vernon Davis left in the second half with back spasms.
Cornerback Tramaine Brock is in danger of missing his fourth-straight start after suffering a toe injury in the first quarter of season opener against the Dallas Cowboys. Perrish Cox has played very well in his place and will continue to start on the left side of the defense.
After being deactivated for last week's game, Vance McDonald will enter Sunday questionable for the second straight week. Jim Harbaugh said McDonald was not cleared by doctors for the Eagles game, despite McDonald claiming otherwise last Friday. McDonald practiced all week in a limited capacity.
For Kansas City, Pro-Bowl safety Eric Reid will not play after suffering an ankle injury in Week 2's game against the Broncos. The offense will be without Donnie Avery (groin), meaning former 49ers first-round pick A.J. Jenkins will get a volume of snaps Sunday.
Here's the full status report:
C Marcus Martin (knee)
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)
WR Donnie Avery (groin)
S Eric Berry (ankle)
CB Marcus Cooper (knee)
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