"We're going to beat Detroit," he said. "I'm very angry right now, as you can see, because we prepared way too hard (to lose on Monday). But we're going to go out there and get 'em."
The Vikings have lost three of their last four games against the Lions, including a 17-3 defeat at TCF Bank Stadium last October, when quarterback Teddy Bridgewater was sacked eight times and coach Mike Zimmer criticized his team's preparation afterward.
Zimmer had strong words for his team Monday, too.
"I don't even know who is out there today," Zimmer told reporters Wednesday, recalling what he told his team at halftime against the 49ers. "I don't even know who this team is. I've never seen this side of us before, never."
Griffen, who had 12 sacks last year, had an off night Monday. He split a sack with Chad Greenway but was penalized twice and was one of the culprits in a run defense that allowed San Francisco to gain 120 of its 230 rushing yards outside the tackles, according to ESPN Stats & Information.
"It's embarrassing," Griffen said. "We should take it personal, and I take it personal. We're going to go out there and we're going to do our jobs. That's all I can say. I'm done here."