Dennis Allen said that the injury was not serious, and not a cause for concern. He noted that Schaub will be evaluated daily and is expected to return soon.
The short term beneficiary of this injury is rookie quarterback Derek Carr. David Carr‘s younger brother was a second-round pick, and will be getting first-team reps with Schaub sidelined for the time being (via Twitter).
Schaub brought up the soreness for the first time yesterday.
McDonald draws comparisons to the quarterback situation from last season, when Matt Flynn was set to be the starter after being brought in via a trade with the Seahawks. That was before a sore elbow held him out of practice towards the end of the preseason. Flynn would never regain a hold of his starting job, as Terrelle Pryor and Matt McGloin shuffled back and forth in and out of the lineup (via Twitter). Flynn would eventually be released, allowing him to rejoin the Packers later in the season.
If Carr impresses with the first team, it could accelerate his path to the starting job the Raiders hoped he would eventually take.