Peterson said his ankle "got rolled up" when he was tackled on a 1-yard carry late in the second quarter. Neither Peterson nor Vikings interim coach Leslie Frazier would speculate on the running back's prospects for next week's game against the Buffalo Bills.
"We'll know a little more about Adrian tomorrow," Frazier said, "after they do whatever examinations they have to."
The Vikings initially said Peterson was probable to return to the game, then downgraded him to questionable. He had his ankle taped, then stood on the sideline testing it, stepping gingerly at times and attempting short sprints.
"It started to throb a little bit," Peterson said. "I was trying to keep it loose, jogging, but it really didn't help out."
Peterson went over the 1,000-yard mark for the season for the fourth time in his four-year NFL career before he was hurt. He finished the game with six carries for 36 yards, including a 5-run touchdown run on Minnesota's opening drive.
"Toby Gerhart, man, take my hat off to him and our offensive line, just understanding our situation," Frazier said. "We came in at halftime, we had an idea that Adrian might not be able to go in the second half, and we wanted to emphasize that it wouldn't change our game plan. We were going to trust our offensive line to do what we talked about all week long, and they didn't flinch."
Redskins cornerback Carlos Rogers injured his left hamstring during the second half. An injury to Rogers' right hamstring kept him out of the previous week's overtime victory over the Tennessee Titans.
Copyright 2010 by The Associated Press