The final injury report for the week was just sent out and there are a couple interesting additions to it. Vikings WR Percy Harvin has been dealing with some sort of illness and has missed practice the last couple days. While it's true that rookie receivers take time to develop in the NFL, I think that a receiver with Harvin's skill-set is a bit of a different case. Aside from being used on short routes he can bust long, Harvin is also a wildcat and reverse option in the rushing attack. I tend to think this helps a receiver develop in the league, although it's more speculation than anything else on my part.
As for the 49ers, Gore and Coffee are probable, which tends to mean there's virtually no chance they'll miss the game. I have noticed though that David Baas has been on the injury report the last couple weeks with a variety of ailments (bicep and ankle injuries). He's struggled a bit and it might be do to some of these nicks and dings.
49ers
Questionable
LB Marques Harris (toe)
Probable
G David Baas (ankle)
LB Ahmad Brooks (knee)
RB Glen Coffee (hip)
RB Frank Gore (ankle)
Vikings
Out
LB Erin Henderson (calf)
Questionable
WR Percy Harvin (illness)
LB E.J. Henderson (shoulder)
Probable
RB Adrian Peterson (back)
TE Jim Kleinsasser (hand)
S Madieu Williams (shoulder)