Alex Salmond has suggested that a SNP deal with a minority Labour government is "probable" on a case-by-case basis.
Speaking to ITV News Correspondent Martin Geissler, the former SNP leader, said a vote-by-vote arrangement with Labour's Ed Miliband would be much more likely than any other agreement, should the result of May's General Election require a deal between the two.
What I've said and what Nicola has said, more importantly, confidence and supply is possible, but vote by vote is probable. I think that's a good way to express it.
Mr Salmond also said the agreement could help Labour form a "powerful" position:
I've been in the position of leading a minority Government, I did it for four years here in Scotland, and in these circumstances you have to find support and the fact that we said look on a case by case basis we'd be able to vote for progressive ideas, progressive politics, I think is a very powerful position.