A leading anti-independence politician in New Caledonia says he wants the French constitution changed, should on Sunday a large majority vote against independence.
Pierre Frogier, a former president who now represents New Caledonia in the French Senate, says a massive no-vote should be the end for any more referendums on the topic.
Mr Frogier said he is set to propose to amend the constitutional provision which allows New Caledonia's Congress to request a second and third referendum by 2022.
The pro-independence movement has said in case of a no-vote, the two next referendums will be called.
It has suggested that should it fail to secure independence by 2022, it will negotiate with France directly.
After Sunday's vote the French president Emmanuel Macron will address New Caledonians once the referendum result is in.
On Monday, the French prime minister Edouard Philippe will arrive in Noumea to discuss the referendum outcome with local leaders.