Jenkins had not practiced all week and the Falcons ruled him out Friday. He was injured six weeks ago in a scrimmmage before the first preseason game and hasn't had any contact since then.
Harry Douglas started in place of Jenkins in the season opener, a 15-9 loss at Pittsburgh.
Safety Erik Coleman has not practiced all week because of an injured left knee. He was hurt against the Steelers but returned to finish the game. The team listed him as questionable for Sunday.
If Coleman can't go, second-year player William Moore would likely get the start.