Adrian Peterson's season is over. The Arizona Cardinals are placing the veteran running back on injured reserve, a source informed of the situation told NFL Network's Tom Pelissero. Peterson has missed the last two games with a neck injury. ESPN first reported the development. The move comes a day after Cardinals coach Bruce Arians said he had "no idea" if Peterson would play again this season. Pelissero reported that Peterson won't need to undergo surgery for the injury. Although the injury isn't considered serious, it's a disappointing end to what has been an interesting season for the seven-time All-Pro selection. After a disastrous four-game stint in New Orleans, Peterson was traded to an Arizona squad desperately looking for a running game resurrection after David Johnson was lost to injury.