Vikings coach Leslie Frazier said Thursday night that Peterson probably will be a game-time decision.
"We've got a lot of things we want to get done with him this week, and I doubt that we would know without getting him through an entire week, if we thought he was ready to play a game," Frazier said after the Vikings fell to the Houston Texans 28-24 in their preseason finale.
Peterson has not played in any preseason games as he continues his recovery from Dec. 30 surgery to fix tears in his anterior cruciate ligament and medial collateral ligament.
Despite the lack of game action, Peterson has continued to say he plans to be ready for the opener.
"My goals are still the game," Peterson said last week. "I look forward to being back the first week" of the regular season.
Frazier previously had said the running back's rehab has been ahead of schedule.
"Even the things he's doing in practice, there's nothing that makes you feel like you have to pull back just from watching him move around," Frazier said last week. "But the more things we can give to him in the time we have leading up to the season opener the better."
Information from The Associated Press was used in this report.