It’s likely the Raiders must push on without RB Darren McFadden in the short term. That switches focus to Rashad Jennings, who would take over as feature back.
McFadden said he'd rather miss a game or two to ensure he's good for the long term, and since that was a direct quote it seems very doubtful McFadden plays this week - although he's not officially ruled out yet. Two games would take him right to the Raiders bye week, so it would be plenty of time to get the hammy back to full strength. Those games would include this week against San Diego and next week against Kansas City.