USC Athletic Director Pat Haden underwent an unspecified medical procedure Thursday and was expected to remain hospitalized for another day or two, a person with knowledge of the situation said.
Haden, 63, was hospitalized Wednesday after feeling lightheaded outside Heritage Hall. Paramedics took him to one hospital where he was later discharged. Haden then went to another local hospital and spent the night there before Thursday's procedure.
Haden, who has a pacemaker, was resting comfortably after Thursday's procedure, said the person with knowledge of the situation, who requested anonymity because of the sensitive nature of the situation.
Haden has been USC's athletic director since 2010. He announced last week that he would retire at the end of June. He will then transition into a one-year role guiding USC's planned $270-million renovation of the Los Angeles Memorial Coliseum. The Trojans and the NFL's Los Angeles Rams are expected to share the stadium for the next three seasons. The Rams are scheduled to move into a new Inglewood stadium in 2019.
USC is in the process of seeking Haden's successor. The school could appoint an interim athletic director if Haden is unable to fulfill his duties through June.
Haden has experienced a series of health-related issues in the last 18 months.
In October, he required medical attention on the sideline at Notre Dame after feeling lightheaded. Two weeks later, he resigned from the College Football Playoff selection committee, he said, because doctors advised him not to travel. He was absent from seven of USC's final eight football games.