Schaub went to the hospital on Tuesday and stayed overnight. He ranks fifth in the AFC in completion percentage (64.2) and yards passing (2,320). Dan Orlovsky is Schaub's backup, and Matt Leinart is next on the depth chart.
Kubiak says Schaub took about half the first-team snaps on Thursday. The only way Schaub will not start is if he has a setback before the game.