Houston has a hamstring issue he's dealing with and Johnson is listed as a knee injury. Johnson also missed last Wednesday's practice with a knee issue, but was fine to play Sunday.
Keep an eye on this -- and Johnson is tentatively scheduled to talk later Thursday.
Linebacker Ashlee Palmer also missed practice, but that is a typical Thursday off for the starter.
Oh, new wide receiver Kevin Ogletree was out there Thursday as well, wearing No. 11.
Official practice report comes out at 4 p.m. ET.