NSW Origin hopeful James Roberts' career is again at the crossroads after he was allegedly involved in another off-field incident.

Roberts is at the centre of an NRL integrity unit investigation following a drunken night out on Sunday. It's alleged the Brisbane centre was heavily intoxicated at Brisbane's popular watering hole, The Normanby Hotel.

Ben Hunt and James Roberts, right, celebrate a try for the Brisbane Broncos against the South Sydney Rabbitohs in April. Credit:Getty Images

Sources claim that Roberts refused to leave the premises at the request of hotel staff and that security were forced to put him into a "sleeper hold" to restrain him. It's understood ambulances were called to the scene as security staff tried to rouse him. It's claimed that he regained consciousness in an ambulance but refused call it a night and then proceeded to another pub.

The Broncos and the NRL are aware of the incident, although it's unclear whether Roberts will be forced to stand down for Thursday night's match against Canterbury at Suncorp Stadium.