A representative for the James family told TMZ on Tuesday that the 18-year-old athlete was rushed to the hospital and treated in the critical care unit (ICU) before being discharged to general care.
"Yesterday while practicing Bronny James suffered a cardiac arrest. Medical staff was able to treat Bronny and take him to the hospital. He is now in stable condition and no longer in ICU," the statement began.
"We ask for respect and privacy for the James family and we will update media when there is more information."
The statement concluded with LeBron and his wife Savannah, thanking USC medical and athletic staff for their "incredible work and dedication" to the safety of their athletes.
The school's Galen Center, where the team practices and plays, is the location of the 911 call, according to sources who spoke to the publication. The patient, later identified as Bronny, was taken to the hospital in a light-and-siren-equipped ambulance.
Bronny recently committed to USC and is anticipated to follow in the footsteps of his famous father by playing in the NBA.
The Los Angeles Lakers legend, 38, previously has expressed his desire to play alongside Bronny in the pros, saying he'd do "whatever it takes" to have at least one season together.
