26-year old DE Jay Richardson needed surgery on his left knee which cause him to miss the rest of the pre-season.  Richardson played in 16 games (0 starts) for the Raiders last season and he had 23 tackles and 3 sacks.  He has now played in 48 games (22 starts) in his three years with the Raiders and he has 109 tackles, 7 sacks and 1 pass defensed.  Richardson is part of a rotation at DE so they hope he’s ready to return to action when the season starts.