Green MP Kevin Hague could have competition for the party's leadership as two more MPs have tentatively suggested they might enter the contest.
MPs Gareth Hughes and Kennedy Graham would not rule out bids for the male co-leadership position, which will be up for grabs when Russel Norman stands down in May after eight years.
Mr Hughes confirmed yesterday he was consulting with supporters about whether he should enter the race, but said he would not confirm his intentions until closer to the nomination deadline in mid-April.
He is ranked fifth on the party's list and has gained some profile in lobbying for environmental causes.
Dr Graham, who is one of the party's senior MPs and speaks for the party on foreign affairs, said he "had not discounted the idea" of entering the leadership race.