Asylum seekers on Manus Island will soon have their day in court, with all of them expected to join a legal challenge to the detention centre and their being held there.

On Friday, leading PNG lawyer Ben Lomai​ filed submissions to the country's Supreme Court on behalf of 288 asylum seekers.

All the asylum seekers on Manus Island are set to join a legal challenge to the detention centre and their ongoing detention. Credit:Andrew Meares

They join 302 who have already added their names to the claim and, next month, Mr Lomai is expected to add the remaining asylum seekers in Manus Island to the claim.