It is alleged the 23-year-old pulled on a woman’s hair causing neck pain which subsequently led to his removal from the premises by security early Sunday morning.

He had been at the Magic Millions races on Saturday.

“Late yesterday I was made aware of an allegation involving a player via a media organisation,” White said in a statement.

“At that time, the club had not received any information or complaint from any external person, licensed premises or investigative authority directly involved in this matter.

“The club still has not.

“However I immediately notified the NRL Integrity Unit and they have subsequently commenced their inquiries.

“The club supports these enquiries being conducted independently and expediently, will offer any assistance and support required, and will only make further comment once the process has been completed.”

The woman told the Courier Mail she had ongoing pain from the incident.

"He came up from behind me and pulled my hair quite hard and yanked my head back," she said.

"I had a sore neck all day yesterday."

It is the latest in a string of off-field incidents involving Roberts.

He was fined $20,000 by the Broncos for abusing a female staff member in a drunken bender at a Brisbane pub.  

Last year he was suspended for kicking an opposition player who was on the ground.

Roberts was let go by South Sydney in 2011 after a series of incidents including smashing a taxi window.

He was sacked by Penrith in March 2014 for off-field woes.