The Labour party will decide this week whether it will pursue an electoral petition to challenge the result in the Waitakere electorate.
National's Paula Bennett reclaimed the seat from Labour's Carmel Sepuloni following a judicial recount last week, which put Ms Bennett nine votes ahead.
An electoral petition is the final means by which the Labour party can challenge the outcome.
Labour members and officials are still to decide whether they will pursue the electoral petition option, Ms Sepuloni told NZ Newswire.
She added that at this stage it's unlikely and it was not up to her to make the decision but something for party members and officials to decide.
Ms Sepuloni has served the last three years as a list MP for Labour.
However, by losing the Waitakere seat and being ranked too low on the party list, Ms Sepuloni is now out of parliament.
Raymond Huo, the next person on the Labour list, will be the party's 34th MP if the result stands.
On election night, Ms Bennett was 349 votes ahead of Ms Sepuloni, but after special votes were counted, Ms Sepuloni was declared the winner by a margin of 11 votes.
The National party then applied for the judicial recount, which tipped the seat in their favour.
NZN