Parliament's Speaker, Seoule Simeon, has ruled that Gracia Shadrack, MP for Malekula, should lose his seat for missing three consecutive sittings.
The Daily Post reports that Mr Shadrack, an Opposition MP, is to challenge the decision in court.
The Opposition claims that Mr Shadrack had been absent for medical reasons.
It claims that a letter explaining this was provided to parliamentary staff and should have reached the Speaker's office.