Arizona places Mathieu on injured reserve, re-signs Clemons
The moves come a day after coach Bruce Arians said Mathieu is out for the season with a torn ACL.
Clemons played in the Cardinals' first five games, making two tackles on special teams and one on defense.
Clemons was placed on injured reserve with an ankle injury on Oct. 14 and was released with an injury settlement on Oct. 19. He has appeared in 78 games.
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