Raiders quarterback Jason Campbell injured his wrist before leaving Saturday's preseason loss to the 49ers with a stinger. Campbell was taken off the field in a cart after being hurt on a sack by Travis LaBoy in the second quarter. He hurt his right wrist on the previous series in the game. He underwent an MRI on Sunday and will be evaluated again later this week. "Usually I recover pretty fast," Campbell said. "Right now there's no timetable. The thing is just to improve and continue to keep getting better. We don't know the timetable or anything, but at the same time, I haven't really missed any time before." Oakland coach Tom Cable said that Campbell's wrist is the more immediate concern.