Pecking around the Internets, I found this:
An MRI Monday revealed that Ahman Green's knee injury isn't serious, but Green said he doesn't know if he'll be ready for Week 4. "It's nothing bad," Green said. "Just swelling. I'm taking it one day at a time." Green may not have an injury that will keep him out for an extended period, but this is a situation to closely monitor this week. If Green sits and Ron Dayne is recovered from a chest injury, Dayne will start against Atlanta.