The NSW Premier Gladys Berejiklian has added to the pressure on NSW Liberal MP Daryl Maguire to resign, as the Australian head of a Chinese property developer who was named as his client says the company has "zero tolerance" for illegal behaviour.

Country Garden Australia chief executive G.T. Hu declined to comment on the recording of Daryl Maguire's conversation with former Canterbury City councillor Michael Hawatt, played in Friday's hearing of an Independent Commission Against Corruption inquiry, that led to Mr Maguire's resignation from the parliamentary Liberal Party and calls for him to resign from Parliament.