Schaub sat out because of a sore throwing shoulder.
Dealing with injuries to key players is nothing new to the Texans.
Andre Johnson is expected to sit out Sunday when the Texans (3-2) play the Ravens (3-1) after hurting his right hamstring in the Texans' 17-10 win over Pittsburgh in Week 4. Mario Williams, the Texans' career sacks leader, is out for the season after tearing a pectoral muscle Sunday in a 25-20 loss to Oakland.
Information from The Associated Press contributed to this report.