Peterson, who said he is experiencing pain in his mid-foot area, is scheduled to undergo an MRI on Monday after X-rays were negative. The NFL's reigning MVP said he does not believe the injury is season-ending.
"Not at all. You should've seen me in here, trying to get back out there," Peterson said. "I kept my pads on throughout most of the third quarter, until I finally was like, 'I'm not going to be able to go.'
"I'm just going to get the MRI done tomorrow, see what it says, and try to push to be ready to play."
Peterson was carted to the locker room after suffering the injury early in the second quarter of Minnesota's 29-26 loss.
"I was trying to get the first down," Peterson said. "After that, I didn't know what happened to the football. I was more worried about my ankle."
Peterson immediately rolled over in pain and had to be helped off the field. He was taken to the locker room in a cart after doctors examined his leg on the sideline.
Peterson, who was questionable to play in Sunday's game because of a groin injury, had carried a combined 67 times in the Vikings' previous two games and had vowed to play. Peterson had gained just 13 yards on seven carries, as he was unable to find much running room on a snowy field in Baltimore.
If the injury is serious, it would be the second one for Peterson in the state of Maryland in less than two years. He tore his left ACL on Christmas Eve in 2011, in a game against the Washington Redskins at FedEx Field in Landover, Md.