West Coast-based Green Party MP Kevin Hague has not revealed whether he hopes to become his party's new co-leader.
Russel Norman announced on Friday that he would stand down as co-leader at the party's annual meeting in May.
Mr Hague, who is number three on the party list after Dr Norman and co-leader Metiria Turei, wouldn't comment on Friday on whether he hoped to fill the role.
He said it should be a day to celebrate Dr Norman's achievements in building the party's electoral success and his many years of service.
Dr Norman had been the party's co-leader for nine years and started working in Parliament in 2002. He now had three children under four.