Adrian Peterson to undergo MRI after knee injury

MINNEAPOLIS - Minnesota Vikings star Adrian Peterson hopped to the sideline in the third quarter of Sunday night’s game against the Green Bay Packers with a right knee injury. He was then carried to the locker room and ruled out for the remainder of the game.

Vikings coach Mike Zimmer said after the Vikings' 17-14 win he did not know the extent of the injury but that an MRI was scheduled for Monday morning.

"Whatever it was, it calmed down," Zimmer said. "So we'll see."

The injury occurred on a 5-yard run with about three minutes left in the third quarter and the Vikings up 10-7. Peterson went to the sideline, where Vikings medical personnel appeared to be working on his right calf or ankle area.

It had been tough sledding all night for Peterson, who had 19 rushing yards on 12 carries when he departed.

He was replaced in the game by third-year veteran Jerick McKinnon.

Follow Tom Pelissero on Twitter @TomPelissero.