Creighton guard Josh Jones was taken to a Lincoln hospital for tests after passing out before the Bluejays' game against Nebraska.
Jones' condition wasn't known Thursday night. He had heart surgery in September 2007.
Coach Greg McDermott said after the game that Jones feinted during pregame warmups. He was taken out of the Devaney Center on a stretcher.
His mother did not respond to text messages.
Jones was diagnosed with a bacterial infection - infective endocarditis - early in his senior year at Omaha Central High School. He underwent open-heart surgery to replace his aortic valve with one formed from cow tissue.
He resumed playing basketball in December 2007 and hadn't had any heart issues since.