Thomas said he had been approached by four or five different people to withdraw but would not "because I am not a quitter", nor would be breach faith with people who supported him.
"A Goff win seems inevitable unless Aucklanders get engaged" said Thomas, who plans to use the remaining weeks of the campaign to "make people aware of the lack of change a Phil Goff mayoralty will bring".
Yesterday, Thomas began placing red stickers over his billboards saying "PHIL GOFF = MORE OF THE SAME". He plans to stand again for the mayoralty in 2019.
Crone said Thomas' surprise announcement was very confusing.
"He is saying he has given up but wants to have another run in 2019."
Crone said it would have been good for the centre-right to unite and give Auckland what its needs and deserve, but her focus was to keep fighting right to the end.
The Herald understand Crone's campaign is struggling financially. Last month, she sent a letter to supporters seeking donations of $1500. A source close to her campaign said Crone has been trying to rustle up $10,000 for television advertising.
Crone said she had been fundraising unashamedly to get her name out there. Supporters had been incredibly generous - "sometimes they said 'yes' and sometimes 'no'", she said.
Meanwhile, three centre-right councillors, Penny Webster, Linda Cooper and Bill Cashmore, have signed a confidence and supply agreement with Auckland Future, the new centre-right ticket that has pledged to cap rates at 2 per cent, slash staff and running costs and pay down debt.
The three councillors have committed to voting as a block with Auckland Future on budgetary matters, according to the agreement.
Cashmore said he would work on a common policy but it would be irresponsible to sign the pledge. Cooper and Webster said the three had agreed to work with Auckland Future on issues and, where possible, vote together.
Cashmore and Cooper, both National Party members, and Webster, a former Act MP, have been staunch supporters of Mayor Len Brown's fiscal policies. Cashmore devised a targeted transport rate that increased household rates by 4.4 per cent to 9.9 per cent last year.