Prime Minister John Key has confirmed electorate deals with ACT in Epsom and United Future in Ohariu.
Key said National had 'carefully considered' a deal with the Conservatives in East Coast Bay's, where leader Colin Craig is standing and had sought a deal, but decided against it.
Key said he believed it was important for voters to be fully informed before elections.
He said National's preference was to work with parties it had existing relationships with, but said the party could also work with NZ First and the Conservatives.
Key said the party was seeking to maximise National's Party vote.
National had 'weighed up a lot of different factors' when deciding on whether to do a deal with the Conservatives, he said.
Key said the main reason was they did not want to pull Foreign Minister Murray McCully from his East Coast Bay's campaign, which would have been necessary to help Conservative Party leader Colin Craig.
Our team had live updates from the press conference, where Key also answered questions about claims Conservation Minister Nick Smith 'bullied' Fish and Game, and democratic reform in Myanmar: