Brown's absense could affect the Texans' game plan if they need to provide chip-blocking assistance from tight ends to provide help to Harris, taking talented tight ends Owen Daniels and Garrett Graham out of passing patterns.
Meanwhile, the Ravens' biggest injury is to Pro Bowl running back Ray Rice. He's officially listed as doubtful on the injury report and didn't practice all week.
Backup running back Bernard Pierce is slated to make his first NFL start. Rice's left hip flexor strain is regarded as a two-week injury, according to sources.