Adrian Peterson could join the Vikings in practice as soon as next week. Minnesota's coaching and medical staffs will evaluate Peterson's left knee after the team returns from San Francisco, the site of their first preseason game Friday night. "I'm looking forward to being out here pretty soon. I've been out for like two weeks, and it's time to get going," said Peterson, who tore his anterior cruciate and medial collateral ligaments last December. "I know that they understand that, and they've been watching and they've been getting good feedback. So I'm sure they are pretty much as excited as I am."