Police inquiries centre on 2012 defamation case which criketer won after being accused of match fixing.
Chris Cairns will be told in the next two weeks whether he will be charged by British police with perverting the course of justice as the fallout from Lou Vincent's match-fixing ban continues.
The inquiries, which brought London's Metropolitan Police to New Zealand to interview the 44-year-old, centre on a 2012 court case.
Cairns successfully claimed 90,000 ($177,300) in libel damages from former ICC chief Lalit Modi after Modi accused him of involvement in match-fixing in the now defunct Indian Cricket League.
Vincent, a former teammate of Cairns, was handed a life ban from cricket earlier this year after pleading guilty to fixing a series of matches and is understood to have passed information to the police allegedly implicating the high-profile former all-rounder.