The Facts: Peterson sustained a slight hamstring pull while working out the week before the start of training camp, HC Mike Zimmer said Saturday. The NFL's leading rusher has missed the team's first two practices, but Zimmer doesn't expect Peterson's injury to be a long-lasting issue. "He can do things; he just can't turn it all the way loose," Zimmer said. "We're just being careful."

Diehards Line:Peterson took the Vikings' conditioning test Friday, a day after the rest of the roster did, and worked on the side with the team's athletic training staff for a second straight day Saturday. ... As the Vikings ease Peterson into action, they've had a chance to take a longer look at Jerick McKinnon, who posted 673 yards from scrimmage as a rookie and helped jump-start the team's offense late last season as a runner and receiver. "It's good we get to see some of these young backs. But [Peterson will] be out here fairly soon, I think," Zimmer said.