"I've now had five years of low and negligible PSA readings, which tells me I'm in the clear."
Voting in the leadership battle between Mr Little, Grant Robertson, Nanaia Mahuta and David Parker closes at noon tomorrow and with most votes already cast, the result is expected shortly after that.
Mr Little is one of the frontrunners. The former union boss is expected to have the support of the majority of Labour's affiliated unions, which between them have 20 per cent of the votes. Herald soundings suggest support from his 31 caucus colleagues, who between them carry 40 per cent of the vote, has firmed up in recent weeks from six to seven.
Labour contest
• A four-way contest between Andrew Little, Grant Robertson, Nanaia Mahuta and David Parker.
• Voting closes tomorrow at midday.
• Party executives expect to announce the new leader at 1.45pm.