About 900 local leaders and more senior members of the National Coalition party will vote.

The Centre and National Coalition parties have just 86 of parliament's 200 seats.

The third partner in the coalition will be the conservative National Coalition party, led by outgoing premier Alexander Stubb.

The third coalition partner, the pro-EU National Coalition Party (NCP) also said it might not want to cooperate.

But as it stands, his National Coalition party will be lucky to scrape back into power as a junior player.