Bronny James, the 18-year-old son of LeBron James, was hospitalised after going into cardiac arrest during a basketball practice at the University of Southern California, according to a family spokesperson.

The spokesperson said in a statement Tuesday he is now in stable condition and out of the intensive care unit.

The incident occurred Monday morning, when he collapsed on the basketball court, according to Shams Charania of The Athletic and Stadium.

Bronny, whose name is LeBron James Jr., was reportedly unconscious when the ambulance arrived at USC's Galen Center, and rushed to the hospital where he was treated by the medical staff.

"We ask for respect and privacy for the James family and we will update media when there is more information," the statement said.

Considered one of the top high school recruits in the United States, the younger James made the decision in May to play college basketball at USC over Ohio State and Oregon.

The 38-year-old LeBron has said previously that he would like to play in the NBA along with his oldest son Bronny, and announced two weeks ago that he will return for his 21st pro season and sixth with the Lakers.

The NBA's all-time leading scorer and four-time league MVP is coming off another stellar season in 2022-23, averaging 28.9 points, 8.3 rebounds and 6.8 assists in 55 games.