Voters will give the Liberal Party "a kicking" at the Miranda by-election this weekend, Premier Barry O'Farrell predicts.
Labor's Barry Collier is hoping to reclaim his old seat in Sydney's south on Saturday, against Liberal candidate, solicitor Brett Thomas.
The by-election was sparked by the mid-term resignation of Sports Minister Graham Annesley, who quit parliament to become CEO of the NRL's Gold Coast Titans.
Mr O'Farrell expects to be punished.
"We will get a kicking in Miranda because people are understandably concerned about having to go to the polls halfway through a term when they didn't expect to," he told reporters on Tuesday.
"But we are in the race to win and we are working hard to win the seat."
Mr O'Farrell would not comment on reports that Liberal Party polling suggested it would lose the seat despite Labor needing a substantial swing.
"We do have internal polling, but it is called internal polling because it is not public polling," he said.
Mr Collier, who held the seat from 1999 to 2011, has previously said Mr Annesley's resignation showed the O'Farrell government had taken the seat for granted.
But Mr Annesley has urged voters not to turn on his party's candidate.
"If the people of Miranda are unhappy about my resignation, their beef should be with me personally," he told News Corp Australia.