NSW Premier Gladys Berejiklian said she would seek advice after it was revealed a figure linked to the recent alt-right infiltration of the Nationals' youth wing was being offered a plum job working for one of her ministers.

Jeff McCormack was one of two people named in Parliament last year by a Labor MP demanding to know if the Nationals would expel him over a branch-stacking exercise that resulted in dozens of alleged neo-Nazis and white supremacists infiltrating the organisation.

NSW Premier Gladys Berejiklian. Credit:AAP

Mr McCormack, who ran Deputy Premier John Barilaro's 2019 election campaign, is expected to take up the role of chief of staff to Water Minister Melinda Pavey after May's federal election.

One minister said they were "dumbfounded" by Mr McCormack's appointment.