One of Sydney's most high-profile legal brothels has denied allegations that illegal drugs are being sold on the premises.

The denials come in the wake of a Four Corners/Fairfax investigation into the behaviour of deregistered neurosurgeon Suresh Nair, who spent thousands of dollars on cocaine and prostitutes while visiting brothels.

Four Corners has interviewed two sex workers who allege they were expected to take drugs with clients at The Golden Apple, and that the drugs were supplied as a "party package" by the brothel.

"There was one night when I went into a booking, and I remember being really like weird at the start because there was cocaine and then I woke up in a back room and there was blood and vomit in my mouth and I was turned on my side," one of the women alleges in an interview on Monday night's program.

Another woman told Four Corners: "It's made a lot of people sick. We've had complaints and the girls have been very sick but they keep giving the same drugs. When I first started there were drugs but not the way I've seen it now. It's just gone out of hand."

Four Corners also reports allegations that some drug transactions were listed on clients' receipts as 'cash out', 'tip' or 'fantasy'.

Dr Nair was jailed after two sex workers died from cocaine overdoses as a result of separate bookings with the surgeon in February and November 2009.

In his sentencing remarks Justice Robert Toner said: "I find as fact that the cocaine ... was in fact supplied by the various agencies" which supplied the escorts. The investigation reveals Dr Nair spent more than $100,000 during lengthy sessions at another high-profile brothel, Liaisons, during the period between the two deaths.

Although the two women who died were not from Liaisons or the Golden Apple, Dr Nair was one of Liaisons' best customers.

Sorry, this video has expired Suresh Nair speaks during a police interview in 2010

The company which runs Liaisons also runs The Golden Apple.

When Four Corners approached the company, it denied ever procuring or supplying any illegal substances to clients or sex workers at Liaisons or The Golden Apple.

NSW police spokesman Superintendent Tony Crandell told Four Corners the new information "will be looked at".

"There's a number of allegations that have been made most recently, and this is an ongoing investigative cycle for Kings Cross detectives," he said.

"This information is new in this sense but not new in the great context of Kings Cross.

"It certainly warrants our investigative attention, there's no doubt about that, whether we can get enough evidence to then take proceedings, that's the question that I need to ask.

"Certainly the new information will be looked at."