The injury doesn’t necessarily rule out Peterson playing against the Carolina Panthers on Sunday, but the Vikings are reviewing all of their options, Zimmer said.
Surgery isn’t always needed on a torn meniscus.
“We’re going through the evaluation process to figure out what the next procedure will be, the options we have,” Zimmer said.
Asked if Peterson might have a chance to play this week, Zimmer said, “I don’t know. We’re still going through all the options.”
Peterson has rushed 31 times for only 50 yards in the first two games of the season.
He suffered the knee injury during the third quarter Sunday night against the Green Bay Packers and was helped off the field without putting any weight on his right leg. He was on crutches in the locker room following the game and had a sleeve on his leg.
“His heel got kind of planted and then the guy hit him from the side a little bit,” Zimmer said.
After the Vikings lost QB Teddy Bridgewater to a season-ending knee injury during a preseason practice on Aug. 30, the loss of Peterson for however long could be significant blow, but Zimmer said the team philosophy he preaches will help.
“This is about the team. Everything that we do is about the team here,” Zimmer said. “We’re not going to be the only team in the league to have injuries. It’s part of pro football, so we’re going to keep plugging away and keep doing our very best to find a way to win.”
In 2014, when Peterson played the regular-season opener and then missed the remainder of the season, the Vikings turned to Matt Asiata and Jerick McKinnon, and that will be the plan again if Peterson missed significant time.
“I have a lot of confidence in those two guys,” Zimmer said. “They’re both different types of runners, but I think the combination of the two can help us.”