Planning Minister Mick Gentleman and speaker Joy Burch are among seven candidates to nominate for a spot on Labor's ticket in Brindabella.

Eligible party members will vote later this month to select the five candidates it will take to next year's ACT election.

Two nominees will therefore miss out.

The Canberra Times understands the field includes Taimus Werner-Gibbings, who ran unsuccessfully in Brindabella at the 2016 poll, and Leah Dwyer, who contested the inner-city seat of Kurrajong at the last territory ballot.

Nurse Shane Carter, union figure Brendan Forde and academic Cathy Day are understood to be the other candidates.

The five successful candidates are expected to be endorsed in early October.

Ms Burch, who resigned from Andrew Barr's frontbench amid controversy in 2016, has already stared down a challenge from within her own Labor faction.

The Canberra Times understands Labor's right faction members met last month to vote on whether to endorse Ms Burch's candidacy.

Despite her seniority within the party and faction, Ms Burch only narrowly secured the backing of members.

There is a view within some in the party that Labor needs fresh faces as its seeks to secure a sixth consecutive term in office at the October 2020 vote.

Ms Burch did not respond to requests for comment.

Mr Gentleman said he would not comment until after the ballot.

Labor received five nominations in the seats of Kurrajong, Yerrabi and Ginninderra, meaning member ballots won't be needed.

Six candidates had put up their hand to run in Murrumbidgee, although one was found to be ineligible.

The Canberra Liberals have completed the first stage of their new preselection process, with the sitting MLA's in all five seats - except for the retiring Vicki Dunne - re-endorsed by branch members.

Party president John Cziesla said nominations for candidates to fill the remaining positions would open on October 7.

Mr Cziesla said there was "substantially" more interest from prospective candidates than there had been ahead of the 2016 election.

Asked to speculate on the reasons why, Mr Cziesla nominated the new preselection process - which gave "clear air" to non-incumbents - as well a "greater level of dissatisfaction in the Barr government".

ACT Labor secretary Matt Byrne said the mood in the party was positive, 13 months out from the next election.