Arizona rookie RB Ryan Williams out for season

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TEMPE, Ariz.. (AP) -- Arizona rookie running back Ryan Williams will undergo surgery early next week to repair a ruptured patella tendon in his right knee.

The season-ending injury for the second-round draft pick out of Virginia Tech came in the Cardinals' 28-20 loss at Green Bay Friday night. Coach Ken Whisenhunt says the team will be looking to sign a running back soon, and may keep looking as other teams make roster cuts.

Cardinals coaches had been impressed with Williams in training camp, with his hard-running style and ability to make cuts. His addition was a major reason the team was willing to trade Tim Hightower to the Washington Redskins.

Williams had been the No. 3 back behind starter Beanie Wells and LaRod Stephens-Howling. The only other running back on the roster is second-year pro Alfonso Smith, who was on the practice squad last year.