Back in the country to be with his wife during the birth of his third child, McCullum broke his silence on the controversy that followed the leak of his testimony to the ICC which stirred up a storm in international cricket.
In his leaked testimony to the ICC, McCullum had admitted to being approached to fix a match during New Zealand's 2008 tour of England and the Indian Premier League by a former cricketer identified merely as 'Player X'.
The ICC is currently probing how the testimonies of McCullum and his former teammate Lou Vincent, who is also being investigated for corruption, were leaked to the media.
"I gave my testimony to the ICC in good faith so I was shocked when I read it in the media," McCullum said.
"I hope it does not stop others coming forward in the future as all players need to play their part in stamping out corruption," he added.
McCullum, who has been given an all clear by the ICC, said he will continue to offer his support to the governing body's probe into corruption and encourage others to do the same.
"There's still a long way to go, I think," he said.
