The ICC insists it's substantially revamped its anti-corruption arm since Brendon McCullum's reporting of match-fixing.
The former Black Caps captain lambasted the governing body in his Cowdrey Lecture speech at Lord's yesterday.
He was furious his statement about Chris Cairns to the ICC was leaked to the media and was scathing of the ICC's evidence-gathering process.
In a statement, the ICC has commended McCullum for his brave stand against corruption in cricket but is adamant it was not the source of the leak.
"The ICC commended Brendon McCullum two years ago - and continues to do so today - for his brave, courageous and principled stand against corruption in cricket," the ICC said in a statement.