In 11 games this season, McKinnon amassed 538 yards at a clip of 4.8 yards per carry. A third-round pick out of Georgia Southern, he performed well in place of Adrian Peterson.
McKinnon will have a back procedure, with an eight-week recovery time, writes Adam Caplan of ESPN (via Twitter). He should be back in time for offseason workouts.
The team promoted defensive end Justin Trattou from the practice squad to the active roster. The Vikings added safety Ahmad Dixon to the practice squad, reports Chris Tomasson of the St. Paul Pioneer Press (via Twitter).