Two Liberal MPs have told Premier Gladys Berejiklian that they are prepared to plunge the Coalition into minority government if "essential amendments" are not made to the abortion bill.

Mulgoa MP Tanya Davies confirmed to a public meeting on Monday night that she has told Ms Berejiklian that she will "separate herself from the government" if amendments are not passed.

Liberal MPs Tanya Davies and Kevin Conolly. Credit:AAP

Riverstone MP Kevin Conolly later said he had also been left in an "untenable position" by the bill.

The abortion bill will be debated in the upper house on September 17 but several MPs and ministers want the draft legislation to be significantly amended, including banning gender selection.