Chris Hipkins is missing a morning event on a crucial day of campaigning due to sickness.
The Labour leader was due to appear at a Samoan church service in Māngere, south Auckland, but a party spokesperson said his deputy Carmel Sepuloni would step in for him instead.
Hipkins is still expected to speak to media later on Sunday, but another planned event at a temple in Avondale has been postponed.
It is a crucial day of campaigning for the party with advanced voting opening tomorrow and Labour trailing in the polls.
The latest Newshub Reid Research Poll showed the right bloc of National-ACT-New Zealand First will have 66 seats - more than enough to form a Government.
National on Sunday released its plan for its first 100 days in Government if elected.
Luxon said National will remove the Auckland Regional Fuel Tax, restore 90-day employment trial periods for all businesses, extend free breast cancer screening for women aged up to 74, repeal Labour's Three Waters legislation and RMA 2.0 laws and remove the Reserve Bank's dual mandate to get the "Bank focused on putting the lid back on inflation".
National will also have a focus on crime in its first 100 days, with Luxon saying his party will stop taxpayer funding for cultural reports, ban gang patches and gang members from gathering in public, extend the eligibility for remand prisoners to access rehabilitation programmes, crack down on serious youth offending, extend the eligibility for remand prisoners to access rehabilitation programs, encourage more virtual participation in court proceedings and give police greater powers to search gang members for firearms while also making gang membership an aggravating factor at sentencing.
Newshub.