Cody suffered broken ribs and a punctured lung in Sunday's win over the Buffalo Bills, while Daniels apparently has a back issue. Daniels has appeared on the injury report with separate hamstring and thigh issues in recent weeks, as well.
Running back Ben Tate (hamstring) and wide receiver Kevin Walter (groin) were also held out of Wednesday's practice. Starting tailback Arian Foster (non-injury), defensive end Antonio Smith (ankle) and cornerbacks Johnathan Joseph (quadricep) and Brice McCain (knee) were limited participants on Wednesday.
The banged-up Texans will face the Chicago Bears in a meeting of 7-1 teams on Sunday night. Kickoff is set for 7:20 p.m. CT, and the game will be broadcast nationally on NBC.