Posted by ESPN.com's Ted Miller
Doctors found no structural damage to Mark Sanchez's left knee, but the USC quarterback will sit out practice Monday and coach Pete Carroll called his status "day-to-day" as the Trojans prepare for a visit from Arizona State.
Sanchez hurt his knee in the Trojans 44-10 victory over Oregon when he was dragged down from behind by Nick Reed. After remaining down for a few moments, he walked off the field under his own power and later returned for a series.
Carroll told reporters the injury is unrelated to the dislocated knee cap that Sanchez suffered in the preseason on the same knee, which is why he has been wearing a knee brace.
If he can't go, Mitch Mustain is in line to step in, though the Trojans backup role has changed hands three times in as many weeks.