EDEN PRAIRIE, Minn. -- Though he is still waiting for the results of a CT scan on his sprained right foot, Adrian Peterson appears to have avoided a serious injury.

The Minnesota Vikings running back said on Monday that an MRI revealed no ligament damage and ruled out the possibility of a Lisfranc injury, which would have kept Peterson out six to eight weeks and ended his season.

X-rays also showed no broken bones in his foot, and while a CT scan will show the injury in more detail, Peterson said "we're just going through the protocol," and added he expects to play Sunday against the Philadelphia Eagles.

Coach Leslie Frazier was more cautious in his optimism than Peterson was, saying the Vikings sent the MRI results to a foot specialist and adding the tests didn't rule out all possible major injuries.

Peterson's foot was in a walking boot on Monday, and while the running back was planning to play, Frazier wasn't ready to rule out the possibility of sitting Peterson for the final three games of the season -- especially now that the Vikings have been eliminated from the playoffs.

"You can't ignore that fact," Frazier said. "You want to know exactly how severe the injury is, and it helps you make that kind of a decision. So as we learn more about the severity of it, or the lack of severity, then you can make a clear decision about this ballgame and future ballgames in this season."

Peterson also made headlines Sunday by calling out Ravens fans for throwing snowballs and game officials for some of the penalties called against the Vikings.

On Monday, he tweeted about the response he has gotten from fans after his comments.

So if you lose respect for me based of me voicing my opinion! That's totally fine! I still have respect for you! — Adrian Peterson (@AdrianPeterson) December 9, 2013

Frazier and several of Frazier's teammates commented Monday on the behavior of fans in Baltimore.

Defensive end Brian Robison said he heard players talking about linebacker Chad Greenway getting hit with a snowball, and Frazier said, "I felt a snowball on my back, too.

"It was not specific to anyone. [It was] anyone wearing purple. It's not what the league wants, not what anybody wants," the coach said.

"It's something we'll talk about. I didn't talk about it after the game. But I did see snowballs coming," he said. "Didn't address it right after the game; there were so many things on my mind, obviously, at that time. But it's definitely something we'll have to talk with our security about and make our league aware of as well."

The Vikings' Adrian Peterson suffered a foot injury early in the second quarter Sunday versus the Ravens. Mitch Stringer/USA TODAY Sports

Frazier also said he got a call from the NFL on Monday regarding the officiating in Sunday's game.

"I actually got a call from the league, unsolicited this morning. And it was a good conversation. When we got off the phone, I said if I were asked the question you just asked, I would reference any comments to the league office.

"But the fact that they called should give you an indication of how they felt about things on that day. [The call was] without any provocation from me, so that was encouraging that they wanted to talk about that game from yesterday."

Frazier said it was the second time the league has called him to talk about officiating this season, though he said "I won't be too specific" about when the first call occurred.

If the Vikings didn't have Peterson on Sunday, they might have to turn to third-string running back Matt Asiata and fullback Jerome Felton; backup Toby Gerhart strained his hamstring on his 41-yard touchdown run in the fourth quarter of Sunday's loss, and Frazier wasn't sure on Monday whether Gerhart would be limited or unavailable for the Eagles game.

Peterson, who won MVP honors after running for 2,097 yards in 2012, was leading the league in rushing before Sunday, when he gained just 13 yards on seven carries before being injured in the second quarter. He now trails Philadelphia's LeSean McCoy by 84 yards for the league lead.