American basketball sensation LaMelo Ball has unceremoniously ended his Australian stint, leaving the country without telling his teammates.

His club, the Illawarra Hawks confirmed the 18-year-old guard had taken a flight home and will continue his rehabilitation from a foot injury, which kept him sidelined since November, in the United States.

Club captain Todd Blanchfield said he was shocked by Ball's sudden departure, which he learned about when ABC Illawarra contacted him for comment.

"It's news to me, but [Ball's camp has] got an agenda they have to take care of," he said.

"At the end of the day he's thinking of the bigger picture and has bigger things in mind.

'Really disappointed'

Meanwhile, the owner of the Illawarra Hawks has criticised the star's unannounced departure from the club.