Defensive tackle Kevin Williams has a bruised and hyperextended knee
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Williams was the victim of an apparent cheap shot in the third quarter, in which 49ers offensive lineman Joe Looney threw a block below the knees away from the play that appeared to blindside Williams.
The Vikings defensive tackle was later seen on the sidelines with a noticeable limp. NBC sideline reporter Michelle Tafoya said during Sunday's broadcast that Williams had left to the locker room to ice his knee.
"From what I understand, it was a dirty play," defensive end Jared Allen told Tafoya during the game. "It sucks."
An MRI performed Monday showed no ligament damage.