The NSW Bureau of Crime Statistics will re-analyse its data after a leaked report showed more than two-thirds of violent incidents at Sydney's Star Casino have not been reported to police.
A Department of Justice review, obtained by the ABC, shows only 24 of 111 incidents between March and August this year were included in monthly reports to casino executives.
Police were only called to The Star, which is exempt from the city's controversial lockout laws, in 36 of these cases despite their serious nature.
This included one incident in which a man's leg was broken and another where someone gashed their forehead.
Bureau director Don Weatherburn says the lack of reporting could have affected data released on the lockout laws in April this year.
If the number of assaults at The Star were under reported since the lockout laws were introduced in 2014, the bureau's data would have been affected, he said.
"If The Star has not been reporting assaults to police, I'm very concerned," Dr Weatherburn told AAP.
"We may have a close look at The Star ourselves to see if there's a drop off in the number of assaults reported by staff.
"I don't think it should be swept under the carpet."
Only Liquor and Gaming NSW can audit whether they've been hiding assaults from police, he says.
Star Casino said the report was inaccurate and reflected a misunderstanding of its incident reporting processes.
"The report fails to address that NSW Police had an on-site presence at The Star between February and September 2015. That on-site presence was subsequently removed," it said in a statement.
"If police had any concerns, it is inconceivable that those resources would have been withdrawn."
A department spokesman said the report was based on incidents that did not result in police attendance.
""The report relies on initial analysis, is not a comprehensive or final view of the adequacy of current arrangements," a spokesman said.
"It's imprudent and premature to draw conclusions at this early stage until a more informed and complete understanding is achieved."
NSW independent MP for Sydney Alex Greenwich said the numbers showed that controversial lockout laws, currently under review, didn't reduce violence but displaced it.
"My constituents in Pyrmont indicated to me that on Friday and Saturday night, there's a slew of people arriving in the area that weren't there prior to the lockout," he told AAP.
"There is obviously a major lapse in judgment from Star's side."
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