Vikings RB/KR Lorenzo Booker was diagnosed with a minor disc problem in his back. The Vikes originally feared worse after Booker collapsed without contact while running a route in Saturday's game. He's expected to be back for the season opener, but it's fair to wonder if the condition will worsen during the season. With Toby Gerhart (Achilles) also banged up, Adrian Peterson may be forced into a bigger role on passing downs this year.