Kolkata: Indian cricket board's interim president Sunil Gavaskar Thursday expressed concern over the recent leak of testimonies given by star New Zealand cricketers to the ICC's anti-corruption and security unit (ACSU).

The leak has "encroached" upon the confidentiality that players depend on while giving such statements to the investigators, Gavaskar said, adding "it's a cause of concern".

"It's a cause of concern. Obviously players depend on confidentiality while giving such testimonies to the ACSU. If such confidentiality has been encroached, it is a matter of concern," Gavaskar, a cricketing legend, told a media conference here.

Earlier this week, British newspaper Daily Mail reported leaked versions of testimonies given by New Zealand skipper Brendon McCullum and former Kiwi batsman Lou Vincent to ACSU.

The UK daily didn't reveal the identity of the player named by McCullum and Vincent but the New Zealand Herald claimed that ex-New Zealand skipper Chris Cairns had been named in testimony to the ACSU.

McCullum confirmed during the day that he did speak to the ACAU officials, but expressed shcok that his testimony got leaked to the media.

The ICC is currently investigating how the leak occurred.