According to Adam Schefter , the Vikings do not plan on using Adrian Peterson on Friday:
Vikings do not plan to play RB Adrian Peterson Friday vs. San Diego, though team is expecting him to argue his case for playing time in game
— Adam Schefter (@AdamSchefter) August 20, 2012
There were thoughts that he could see some game action, but that looks like it will have to be put on hold. All you fantasy folks will have to wait another day to see if he can still move.
The Chargers defense will have to test their run defense later down the line. This just means that we can blitz the quarterback more, hopefully.