Ginn, the 49ers' main return specialist and at times a factor in the passing game, has an ankle injury. The 49ers will give the reps to Kyle Williams in practice as punt returner, and LaMichael James, the rookie from Oregon, is another return man option. James returned kicks a few times for the Ducks, especially when the Ducks needed a long return.
The Packers are still without running back James Starks in practice, and have a host of other players on their injury report Thursday. All the injury status updates from Thursday are here.