The Niners released their full injury report on Friday, and there weren't too many surprises. All-Pro defensive tackle Justin Smith is questionable with an elbow injury. Smith was unable to participate in any of the team's practices this week, but he is generally expected to play on Sunday night.
After being limited in practice the past couple of days, the NFL's co-leader in sacks, Aldon Smith, is listed as probable. Frank Gore was also named probable for Week 16 after practicing all week with a wrist issue.
As for the Seahawks, running back Marshawn Lynch is listed as probable despite dealing with a back issue all week. Wide receiver Sidney Rice has been banged up for most of the season and did not practice before Friday, although he seems likely to play even after being deemed questionable for Sunday.
Check out the full injury reports for both teams here.