The fight to replace former Labor leader Luke Foley in the state seat of Auburn will be resolved by a rank-and-file preselection, after the party's head office rejected a bid by one of its executive members to be parachuted into the seat.

In a move that split NSW Labor's "left" faction, assistant general secretary Rose Jackson's supporters had urged the party to do away with the standard preselection process and instead install her as Labor's candidate for Auburn.

A meeting of the party's powerful Administrative Committee on Friday rejected this approach, with the candidate to be decided at a preselection on December 22.

It was one of two major decisions concluded by the Committee, which also formally disendorsed federal MP Emma Husar from recontesting her marginal western Sydney seat of Lindsay.