College football will be without one of its top defensive players.
Ohio State Buckeyes defensive end Nick Bosa underwent surgery Thursday for a core muscle injury, and coach Urban Meyer said there is no timetable for his return. Bosa had already been ruled out for this weekend's tilt against Tulane.
NFL.com's Daniel Jeremiah and Bucky Brooks have Bosa atop their list of the nation's 25 best prospects.
Nick Bosa, the reigning Big Ten defensive lineman of the year, already had four sacks this season, tied for third in the country.