Stoops wouldn't describe the nature of Foles' injury. The Arizona Daily Star has reported that it appears to be a dislocated right kneecap.
Matt Scott took over for Foles and completed 13-of-18 for 138 yards with an interception in the Wildcats' 24-7 win at Washington State. Scott, who started the first three games in 2009 before Foles took over, will start Saturday against Washington.
Stoops said Foles would be evaluated on a "week-to-week" basis. Foles' knee was treated on Sunday, and the Tucson Citizen reported that he has returned to his home in Austin, Texas, "for a couple of days to be with family and have his knee looked at."