NSW minister Eleni Petinos has been sacked by Premier Dominic Perrottet after an anonymous complaint. 

Mr Perrottet dumped his Minister for Small Business and Fair Trading, Eleni Petinos, one day after he returned from an overseas trade trip.

It comes after an anonymous complaint was made by a staffer from Ms Petinos' office, reportedly alleging bullying.

The Premier said an investigation had taken place into the complaint and he was satisfied with the outcome, but Ms Petinos’ position had become untenable.

Customer Service Minister, Victor Dominello, will take over her ministerial responsibilities.

“Tonight, the Premier informed me I would no longer be a minister in his government,” Ms Petinos said.

“I would never intentionally offend anyone or make them feel uncomfortable, and if I did I am truly sorry.”

The NSW Government has now lost one of just seven women in its 26-person cabinet.

Trade Minister Stuart Ayres may go soon too, as he is  under increasing pressure over the former Deputy Premier, John Barilaro's appointment to a lucrative trade role in New York.