EDEN PRAIRIE, Minn. (AP) -Minnesota Vikings quarterback Gus Frerotte doubtful for the game Sunday against Arizona with a lower back injury.
That means backup Tarvaris Jackson likely will start against the Cardinals as the Vikings look to stay a game ahead of Chicago in the NFC North.
Coach Brad Childress says Frerotte is improving and will continue to be evaluated on Saturday and Sunday. But all signs point to Jackson being under center. He took all the snaps in practice this week and played very well in emergency duty last week against Detroit.
Right tackle Artis Hicks also is doubtful with an elbow injury. Defensive ends Jared Allen and Brian Robison are questionable with knee injuries.
Kick returner Darius Reynaud is out with a bad foot.

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