A British tabloid newspaper claims a fourth Pakistan cricketer is being investigated by cricket's governing body.
Salman Butt, Mohammad Asif and Mohammad Amir are already the subject of police and International Cricket Council investigations over a betting scandal.
The News of the World says the ICC is investigating an unnamed fourth man over match-fixing claims - a more serious charge than the spot-fixing claims faced by the trio.
But the cricketing body said it did not comment on ongoing investigations, the BBC reports.
An ICC spokesperson said: "We are making no comment regarding the suggestion that the ICC is probing a fourth player.
"We do not comment on ongoing investigations, we will not revealing any details about the charges [faced by Butt, Asif and Amir]," added the spokesperson after the paper reported that the three men were facing a total of 23 charges.
The Metropolitan Police said it is not investigating a fourth player, while the Pakistan Cricket Board was not immediately available for comment ahead of Sunday's first Twenty20 international between England and Pakistan in Cardiff.
Test skipper Butt and fast bowlers Asif and Amir have been suspended and charged by the ICC.
In a separate development, the BBC understands that wicketkeeper Kamran Akmal has been contacted in writing by the ICC, though there is no suggestion that he is the fourth player and it is not in relation to incidents in the recent fourth Test at Lord's.
During that match, Asif and Amir are alleged to have bowled three no-balls between them at pre-determined times to facilitate betting coups after agent Mazhar Majeed was reported to have accepted £150,000 from an undercover reporter from the News of the World, who published the story on 28 August.
The BBC says it understands that serial numbers on bank notes seized by the police from the cricketers' hotel rooms tally with those recorded by the tabloid given to Majeed.
In its latest revelations, the News of the World also claimed that batsmen Yasir Hameed spoke to the newspaper about other Pakistani cricketers' involvement in match-fixing.
However, Hameed denied speaking to the tabloid, although the News of the World has since published a video interview with the Pakistan batsman.
Former Pakistan batsman Younis Ahmed insists greed could be the only possible motivation for any of his country's stars to become involved in corruption.
