USC coach Lincoln Riley, center, and his staff no longer have to weigh whether it is worth burning a player’s redshirt season while deciding which players to use during games. But after years of meticulously monitoring that playing time, those adjustments will no longer be necessary, after the NCAA adopted new eligibility rules in June. It currently stipulates that a player’s eligibility clock begins with either their full-time enrollment or the academic year following their 19th birthday, whichever occurs first. Mosley is among the freshmen at USC who will benefit from new eligibility rules. AdvertisementAt USC, that affects two members of the 2026 recruiting class — wide receiver Trent Mosley and safety Madden Riordan.