Brisbane Broncos centre James Roberts will miss the semi-final against the North Queensland Cowboys.

Broncos CEO Paul White says the club will assist the NRL Integrity Unit's investigation into allegations made against star centre James Roberts but reiterated the fact that the club had yet to receive any complaint regarding the alleged incident.

The incident is alleged to have happened in a Gold Coast nightclub on Sunday evening, just three months after Roberts checked himself into a Thai rehabilitation clinic to address alcohol issues.

The 23-year-old was fined $20,000 by the Broncos for an incident in a Brisbane hotel late last season and with a history of disciplinary issues off the field that saw him sacked by both South Sydney and Penrith, is in danger of having his NRL career disappear before his eyes.

White only became aware of the latest incident when he was informed by a media organisation and said that the club would work closely with the NRL until the investigation is completed.

"Late [Monday] 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."

After resurrecting his career with the Titans in 2014-2015, Roberts moved north to Brisbane on the back of a contract dispute and played in every game for his new club other than the semi-final clash with the Cowboys for which he was suspended.

Now a proud father, Roberts' cousin Tyrone Roberts spoke of his good spirits at his wedding in late October while former Titans teammate David Mead spoke of his excitement at reuniting with one of the fastest men in the game at the Broncos less than 24 hours after the alleged incident took place.

Roberts and Mead scored 21 tries between them on the Titans' right edge in 2015 and Mead was adamant that he had seen a change since the pair began pre-season training back in November.

"I've noticed an improvement in him as a person. He's obviously got a lot of good people around him here at the Broncs and is very well looked after," Mead said on Monday.

"He tells me he's feeling pretty happy and excited to play this year. I'm pretty excited for him.

"He's been good since day one. I've turned up and he's put on a couple of kilos and is holding it pretty well. He's training really hard and seems to be in the right place and is pretty excited for Round 1."