Pakistan have dismissed allegations of match-fixing in their recent series in the West Indies as "outrageous."
But the Pakistan Cricket Board have confirmed they are helping the Anti-Corruption and Security Unit (ACSU) of the ICC with their inquiries after experts identified suspicious betting patterns.
The investigation centres on the third match of the series in St Lucia, which ended in a tie, and the final match, which resulted in a last-ball victory for Pakistan.
Pakistan Cricket Board (PCB) interim chairman Najam Sethi hit out at the allegations.
"These are outrageous claims and we have been in touch with the ICC and insist on investigation," he told Pakistan's Geo TV.
"I can't talk much on this but we did contact the team manager and he told us that a couple of days ago the newspaper people were phoning people to get the information," said Sethi.
"The manager confirmed that the ICC's ACSU team was there in the Caribbean. How much truth is there in this, only time will tell but at the moment this is not more than a story."
A board spokesman added: "The PCB is obviously extremely concerned at the allegations of fixing reported in the media with regard to recently concluded one-day series between Pakistan and West Indies."
Pakistan has been embroiled in match-fixing scandals for some years. In 2010 three of its top players - Salman Butt, Mohammad Asif and Mohammad Aamer - were found guilty of match fixing.
Pakistan banned former captain Salim Malik and fast bowler Ata-ur Rehman in 2000 after a two-year long judicial inquiry
The inquiry also fined six other players, including former captains Wasim Akram, Waqar Younis and Inzamam-ul Haq.
The bans came after Australian trio of Shane Warne, Tim May and Mark Waugh alleged Malik offered them bribe to under-perform on team's tour to Pakistan in 1994.