The match was scheduled as a home game for the Vikings, and Peterson believes that the noise created by the crowd rivalled the atmosphere at their own Hubert H Humphrey Metrodome.
"It was great. It was full of energy. The fans went crazy. It was just a great atmosphere to play in," Peterson told reporters. "It's been great.
"The people of London have welcomed us and been great to us. I've had a wonderful time. Just being around London, it's beautiful. Man, it was electric.
"It was coming out that tunnel and just looking out and seeing that purple and yellow, it was a good mix. I think we kind of trumped them a little bit with the purple going out there. But it was full of energy, it felt like a home game."
Peterson, who is the reigning NFL MVP, rushed for 140 yards on 23 carries, including a 60-yard touchdown run.