The NSW anti-corruption watchdog will investigate Premier Gladys Berejiklian for potentially breaching public trust by failing to disclose her relationship with embattled former MP Daryl Maguire.

The Independent Commission Against Corruption said in a statement on Friday that it was investigating whether Ms Berejiklian “exercised public functions” in a position of conflict between her public duties and private relationship with Mr Maguire, revealed in late 2020.

A public inquiry on the matter will be held on October 18.

Ms Berejiklian will address the media on Friday afternoon.

-more to come