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Zimmer: 'Assume' Peterson will be out months

EDEN PRAIRIE, Minn. -- The Minnesota Vikings are preparing to be without running back Adrian Peterson for some time after he had surgery to repair the torn meniscus in his right knee Thursday.

Asked Thursday if it was likely Peterson would miss months, not weeks, after his surgery in the Twin Cities, coach Mike Zimmer said, "I would assume so."

In a statement after Peterson's surgery Thursday, the team said there were "no additional injuries or issues noted in or surrounding the knee joint during the surgical procedure."

On Wednesday, a source told ESPN that Peterson also had a torn lateral collateral ligament.