"Adrian Peterson's final run Sunday proved to be vintage "All Day." Except that it resulted in a shortened afternoon.

First came a dash to the hole, then a cyclone spin to avoid congestion on the left side of the line. Another burst of acceleration left Raiders linebacker Kamerion Wimbley holding nothing but Peterson's right shoe. Yet as the Vikings running back was yanked to the turf a second later, his left ankle rolled up under Oakland's Michael Huff.

Just like that, an impressive 12-yard run morphed into a nightmare scenario for the Vikings. First, Peterson struggled just to limp back to the sideline. Soon after he was carted off Mall of America Field.

On Monday afternoon, Peterson left Winter Park wearing a bulky walking boot, protective footwear he will need for most, if not all, of this week.

The official diagnosis: It's a Grade 1 high ankle sprain with some minor ligament damage.

"The good news," coach Leslie Frazier said, "is there is nothing more serious than that -- the fact that it is an ankle sprain and he'll recover from it. It's just the matter of the amount of time he'll miss.""