Ohio State star defensive end Nick Bosa is withdrawing from school to concentrate on rehabilitation before the NFL draft, the school said in a statement Tuesday.
The junior All-American sustained a core muscle injury in the fourth game of the season and underwent surgery Sept. 20. There was no timetable for his return.
ESPN's Mel Kiper has Bosa as the No. 1 prospect on his latest big board rankings.
"I was hopeful that Nick would be able to return to play again for us," Ohio State coach Urban Meyer said in a statement. "I know this was an extremely difficult and emotional decision for Nick and his family, and I wish him well as he moves on to get himself 100 percent healthy and ready for his next chapter.