The MP for North-West Choiseul in Solomon Islands says he's remaining with the government of Prime Minister Manasseh Sogavare.
Clement Kengava's is the latest name claimed by the group of MPs trying to remove the prime minister following a mass defection from his administration a week ago.
They have given notice for a motion of no-confidence against Mr Sogavare to be tabled when parliament sits again, which it's required to do before the year end.
Meanwhile, both sides continue to claim a majority of MPs.
But Mr Kengava says the opposition's claim that he has defected to join them is unfounded.
"I think the government is at the moment very solid and in terms of numbers we are confident of staying in government, and I think it is the opposition now that is starting to break up here and there, and they are desperate for numbers to confirm their position."