Prime Minister John Key is "absolutely confident" he will have confidence and supply deals with Act and United Future settled this week.
But he is only "optimistic" that he can pull off an agreement with the Maori Party.
The Act and United Future deals would give Mr Key the numbers to govern.
The expectation is, however, that Mr Key will delay going to the Governor-General until he has an answer one way or another from the Maori Party.
National negotiated support deals with all three parties after the 2008 election but the numbers are tighter this time.