The 49ers open the preseason this Friday against the Minnesota Vikings, and while the pre-game injury report is not entirely significant, there are still injuries worth noting. The most prominent involves Vikings running back Adrian Peterson. Peterson suffered tears of his ACL, MCL and meniscus, resulting in late December reconstructive knee surgery. He was placed on the PUP list at the start of training camp and is not expected to be removed in time for this Friday's game.

For the purposes of getting ready for this season, this isn't a particularly huge deal. Even if healthy, Peterson likely would not see a ton of snaps in the preseason opener. Toby Gerhart would seem likely to get the start on Friday with a host of young running backs getting plenty of snaps behind him.

Where it gets more interesting is as the two teams get ready for their week three regular season contest in Minnesota. The public word would seem to indicate he'll be back in time for the start of the season, but until he comes off the PUP list, it's hard to say for certain. The 49ers defense is built to stop the run, but not having to face Adrian Peterson would still be welcome.