The team issued a release Saturday saying Schaub won't play. League sources told ESPN's Ed Werder that Schaub's wife, Laurie, had an emergency C-section to deliver the couple's child, who is several months premature. Schaub's wife and the baby reportedly are doing well.
Rookie Derek Carr won the starting job for the Raiders (0-2) out of training camp after Schaub struggled in his first preseason since being traded to the Raiders from Houston in March. Matt McGloin is the backup.
Also Saturday, Oakland signed linebacker Bojay Filimoeatu to their active roster from the practice squad.
The Associated Press contributed to this report.