MINNEAPOLIS - Adrian Peterson and the Minnesota Vikings have reached a standstill in their relationship.

Peterson's agent, Ben Dogra, said in an interview on Tuesday that he believes a return to Minnesota this season is not in the "best interest" of the standout running back.

Peterson previously expressed uneasiness about continuing to play for the Vikings, but Dogra has advanced that stance to the point of wanting out. General manager Rick Spielman has told Dogra the team doesn't plan to release Peterson, who turned 30 on Saturday.

The Vikings have leverage with Peterson's contract, which covers the next three years with a $12.75 million salary for 2015. However, none of the remaining money on the deal is guaranteed.

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