St George Illawarra centre Tim Lafai was taken to hospital after an incident on Good Friday at his home.
The Dragons confirmed that the 28-year-old was a subject of a police matter and the NRL's integrity unit knows about the incident.
Lafai allegedly injured his hand in the incident which has resulted in him being served with a violence order, but it doesn't relate to any physical assault to his wife or children.
"At about 2pm on Friday April 10 officers from Lake Illawarra Police District were called to a house in Warrawong following a concern for welfare report," a NSW Police spokeswoman said.
"A 28-year-old man was located lying in the backyard of the home. He was taken
to Wollongong Hospital for treatment and hand injuries.
"Police have been told the man allegedly became aggressive after a domestic-related argument with a 27-year-old woman in the home before he allegedly punched a number of walls within the house.
"Upon release from hospital he was served an apprehended domestic violence order. Inquiries are continuing."
The 28-year-old has played 165 NRL games for the Dragons and Canterbury, and 13 tests for Samoa.