Papua New Guinea's deputy opposition leader Sam Basil says he believes a no confidence motion in the Prime Minister Peter O'Neill will be successful, despite not knowing whether his bloc has the numbers.
A vote will be held on Friday afternoon after the Supreme Court ordered the parliament to reconvene to hear the opposition's motion.
The vote was supposed to take place last month, but the 111- seat parliament was adjourned following a police shooting of protesting students.
Mr Basil said it won't be clear whether the 15 member opposition will have the numbers as each side is still trying to rally enough support.
"In PNG politics it's always determined at the 11th hour. People are talking, and I cannot deny that. Members in government are talking to the opposition - not to the opposition, but let's go by party base. All political parties are talking to each other right now."
Mr Basil said he suspects money may be involved in some deals to influence MPs, although he has no first-hand evidence.