The injury to Campbell probably does not affect too many fantasy teams directly, unless you are in a deeper league or in need of a bye week filler, but what the loss of Campbell does effect is the rest of the Raiders' offense.
There has been a lot of news this morning about Carson Palmer being traded to the Raiders. In the long run that may be a huge move and play major dividends to the Raider Nation, but in the short term the skill players on the Raiders' offense may take a substantial hit in value.
How the Raiders' receivers, who have been playing well of late, will be effected by a change at the quarterback position is a storyline to watch in Oakland. Also, will the running game take a hit with Campbell’s injury as well? These are situations that will depend on how effective Carson Palmer, who has not played yet this season, is when he suits up in the silver and black. There really is just no way of knowing before we see him out there.
It is not time to go dropping or trading all your Raiders' fantasy producers. However, proceed with caution because the type of production they will have moving forward is unknown.