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After Sam Shields intercepted Sam Bradford in the third quarter, he left the game with a head injury.
Instead of downing the ball in the end zone, Shields ran around for a while before taking a huge hit from Danario Alexander. He didn't return in this game and without knowing the severity of the injury, it is possible he could miss a few games.
Losing Shields means Jarrett Bush will see more playing time, which isn't a good thing. Bush is far less talented than Shields and was beaten fairly often by the Rams' receivers.
The Green Bay Packers still have a talented secondary without Shields, but if he is out for more than a game or two, expect teams to take advantage of Bush and this defensive unit.