Peterson 'ahead of schedule', runs at Vikings practice

Is Adrian Peterson on his way back?

The Vikings All-Pro running back was seen running off to the side at practice Tuesday, NFL Network's Stacey Dales reported. The 31-year-old went through a battery of tests over the weekend that opened the door for this week's advancement.

Vikings coach Mike Zimmer was optimistic when asked about Peterson's progress on Tuesday, telling reporters, "He's doing good. He's probably ahead of schedule, I guess."

NFL Network Insider Ian Rapoport noted over the weekend that Peterson was on track to make a December return before the playoffs.

Obviously this is good news for the Vikings but perhaps not for Peterson, who will be returning to a much different club than he…