Australian Rugby League Commission chairman John Grant says allegations of verbal abuse made against the Canterbury Bulldogs are serious and he will await a full report before taking further action.

Nine News court reporter Jayne Azzopardi was sent to Belmore Oval yesterday where the club's "Mad Monday" celebrations were taking place behind locked gates.

Nine’s cameras recorded an unknown person or persons yelling sexist abuse from one of the windows at the rear of the old grandstand.

The offensive lines included;:

"There are some ladies here to stick their heads in your pants."

"S--- me off you dumb dog."

"I want to go and punch you in the face."

Fairfax publications were told some players were annoyed that a helicopter was used to film them as they attempted to party away from public scrutiny.

Grant has not ruled out sanctions against any player found to have been involved in the incident.

"Based on what I've heard, there is no doubt this is potentially a serious issue," Grant said.

"The process that we'll now go through is for the club to determine what actually happened, for the club to prepare their own report with their own recommendation.

"That will then come to us and we'll have a conversation with them about it."

Azzopardi contacted Canterbury CEO Todd Greenburg after the incident and he apologised on behalf of the club and promised a thorough investigation.