Minnesota Vikings running back Adrian Peterson said Thursday he will not miss any games, despite playing with a hamstring injury for the past month. Peterson said the injury started out as a bruise, not a pulled muscle. He was limited to 13 carries for 28 yards in the Vikings' last game, a 23-7 loss to the New York Giants on Monday night. Prior to that, he had just 10 rushes in a loss to the Carolina Panthers. He attributed the subpar performances to being mental -- not physical -- effects of the injury. "I feel like it was more in my mind," Peterson said. "It's strange to say that, but I think I was kind of holding myself back, not being able to stretch out and really run. I think I was kind of hindering myself. Now that I'm able to be more relaxed and got a clearer mind, I think I'll be able to go out there and roll full-speed." The Vikings take on the visiting Green Bay Packers on Sunday night. Last season, Peterson ran for a combined 409 yards in two regular-season games and another 99 yards in a playoff game against Green Bay.