Adrian Peterson left the Minnesota Vikings' Week 2 win over the Green Bay Packers in the third quarter with a knee injury.

Peterson will get an MRI on the knee Monday morning, though the injury wasn't thought to be serious and might keep him out for a week.

"Whatever it was, it calmed down now," Mike Zimmer said after the game.

The right foot of Peterson was briefly stuck under the upper leg of Kyler Fackrell as the Packers linebacker brought him to the ground, slightly twisting the knee.