Brendon McCullum keen to focus on cricket following Chris Cairns' trial

New Zealand captain Brendon McCullum is "very comfortable" with the evidence he gave against former all-rounder Chris Cairns, who was found not guilty of perjury and perverting the course of justice in a trial last month.

Cairns had been accused of falsely claiming he had never cheated at cricket when he won £90,000 in damages from Lalit Modi, the former boss of the Indian Premier League, in a libel action three years ago.

McCullum was one of two former team-mates, along with Lou Vincent, who gave evidence against Cairns in the trial, accusing his predecessor as Test skipper of twice asking him to fix matches.

Cairns was found not guilty on November 30 after an eight-week trial at London's Southwark Crown Court.

"I was very comfortable with the evidence I gave in London and I stand by that evidence as well," McCullum told reporters in Dunedin on Wednesday. "I was one of a number of witnesses who gave evidence.

"For me it's not about whether someone is guilty or not guilty. My role was to give evidence in the trial. People will have their own opinions on what unfolded.

"I was comfortable with it, and as I say it's time to move on and focus on a bit of cricket," added McCullum, who makes his 98th Test appearance against Sri Lanka in Dunedin on Thursday.

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Despite their 2-0 series defeat to Australia, New Zealand will start the match as strong favourites against a Sri Lanka side who will be without injured pace bowler Dhammika Prasad who suffered a back injury during their only warm-up match in Queenstown which ended in a draw.

The tourists will also be missing wicketkeeper Kusal Perera after he tested positive earlier this year for a banned substance and was forced to return home this week.

Coach Jerome Jayaratne revealed that Perera had taken medication for an insect bite on his foot, with the belief that the treatment was not on the banned list of substances.