Egbunu's former summer coach, Linzy Davis, confirmed to ESPN that he has been contacted and spoken to the NCAA. USF said in a statement Friday it had been "contacted" by the NCAA over "concerns involving one of our student-athletes."
"We have initiated a review of the matter and have asked the NCAA to assist us," the school's statement said.
USF said the student-athlete was "completely certified and cleared by the NCAA Eligibility Center prior to enrolling." USF would not identify the student-athlete, but sources told ESPN it was Egbunu, who has started 16 of 17 games for the Bulls.
"I feel confident in this matter. John's status has not changed," South Florida coach Stan Heath told ESPN on Friday night. "He will start Saturday against Cincinnati."
Egbunu, who is from Nigeria, is averaging 8 points and 6.9 rebounds for the Bulls.
Davis said Egbunu lived at his home while attending Eagle Landing High in Georgia as a junior, but told ESPN that he has not spoken with Egbunu in more than a year since he left the home.
Davis' son, Drew, and Egbunu both committed and signed with South Florida as juniors in high school. Davis said Heath did not honor his son's commitment and Drew went to prep school this season. Heath told ESPN that Drew Davis was a non-qualifier and was not admissible to South Florida.