Minnesota Vikings running back Adrian Peterson will not play against the Atlanta Falcons on Sunday after the team ruled him out following a Saturday morning walk through.

Peterson suffered a high ankle sprain last Sunday against the Oakland Raiders as early diagnosis of the injury revealed it wouldn't keep the running back out for the season. Peterson spent much of the week out of practice and in a walking boot, hoping to heal enough to give it against Atlanta. But his doubtful status turned worse this morning when the team gathered for final game preparations.

With Peterson on the sidelines, bruising back Toby Gerhart will likely start in his place taking the bulk of the carries, while Percy Harvin and Lorenzo Booker will look to help replace the big play burst Peterson threatens opponents with by himself.

Quarterback Christian Ponder has a chance to raise his profile as a leader on offense, as the rookie will have to manage the team without leaning on Peterson to make plays to keep the ball moving.