The Arizona Cardinals tackled Kellen Clemens in the end zone for a safety to make it 23-3. Mathieu received the ensuing kickoff and returned it for five yards, but his knee was bent awkwardly as he was tackled. He tried to run off the field, but his leg gave out and he went down to the turf where he was treated.
The Cardinals announced he was out for the game:
— Arizona Cardinals (@AZCardinals) December 8, 2013
Mathieu, a third-round pick, has been an excellent playmaker for the Cardinals this season. Losing him would be a huge blow for Arizona.
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