The 49ers have CB Shawntae Spencer for the season after he tore the ACL in his left knee.  He only had made 2 tackles so far this season for the Niners.  Spencer will be replaced by either Tarell Brown or Donald Strickland.  Brown has 5 tackles, defensed 1 pass and he has 1 interception so far this season.  Strickland has also played somewhat well this season as he has finished with 4 tackles and a pass defensed.