Four days before the crucial elections in Greece, French President Francois Hollande have warned voters that failure to respect engagements to international creditors may trigger the country's expulsion from the euro zone.

"I am in favour of Greece remaining in the eurozone, but Greeks should know that this requires there be a relationship of trust," Hollande said in a transcript of the interview with Mega TV, provided by his office.

"I have to warn them, because I am a friend of Greece, that if the impression is given that Greece wants to distance itself from its commitments and abandon all prospect of recovery, there will be countries in the euro zone which will prefer to finish with the presence of Greece in the euro zone."

The French president tried to assure Greeks that if they decided to remain in the euro, they would be helped by their international partners.

Hollande, who has pushed for the eurozone to shift its focus from austerity to growth, said the situation has now evolved even further.

"The financial situation is such that we must also have guarantees so banks can be preserved and supported," said the French president.

"We are already in another stage," of the eurozone crisis. "This is what the Greeks must also understand," he added.

Greece holds its second parliamentary election in six weeks this Sunday, after a May vote failed to produce any workable majority.