Craig is to announce which electorate he will stand in at his campaign launch at Rangitoto College this afternoon, when he will also reveal two new Conservative Party candidates.
Rangitoto College is in Mairangi Bay, part of the East Coast Bays electorate.
Political commentator Chris Trotter said East Coast Bays seemed the obvious choice for Craig.
"It would seem most likely given Mr Mitchell and Ms Bennett's fairly staunch remarks concerning their seats. And if so, that would be a perfectly logical tactical decision on National's part."
However, with Labour plummeting in the latest Fairfax Ipsos poll to just 23 per cent and National going from strength to strength, any deal between National and the Conservatives was far from certain.
"I would have thought that National would hold off for at least another six weeks or so because they will need to see if that 23 per cent is confirmed by other polls," he said.
"If Labour is confirmed to be at 25 per cent or less then they [National] don't have to do anything because the left just cannot make up a gap of that magnitude, unless Kim Dotcom and Hone's [Hone Harawira] party suddenly surges ... but I'm not really picking that."
Labour Party deputy leader David Parker said Craig would stand wherever the National Party threw him a seat.
"On the back of what the National Party did last time in respect of Epsom, we all know that the reason they oppose the abolition of the single seat lifeboat is they want to preserve it for themselves to use inappropriately as they have done in the last few elections."
McCully has until August 26 to register as a candidate in East Coast Bays.