FIFA's chief ethics investigator has said he will complete his probe into the bidding for the 2018 and 2022 World Cups by next week despite fresh allegations surfacing about Qatar's victory.

US attorney Michael Garcia, who met Qatar 2022 World Cup bid chiefs in Oman yesterday, said the investigation would conclude by June 9 and he would submit a report in mid-July.

It comes after it was reported that millions of emails and documents claim to show former Fifa executive committee member Mohamed Bin Hammam made payments to officials as part of a campaign to win support for Qatar's 2022 World Cup bid.

Qatar 2022 has distanced its bid from Bin Hammam, insisted there was no wrong-doing and said it would co-operate with Garcia's investigation.

Mr Garcia said in a statement: "After months of interviewing witnesses and gathering materials, we intend to complete that phase of our investigation by June 9, 2014, and to submit a report to the adjudicatory chamber approximately six weeks thereafter.

"The report will consider all evidence potentially related to the bidding process, including evidence collected from prior investigations."

Meanwhile, Prime Minister David Cameron, who took part in the final throes of England's failed 2018 bid, said Garcia's inquiry should be allowed to take its course.

Mr Cameron said: "We will see what happens with this inquiry into the World Cup. And who knows what the chances may be for the future.

"There is an inquiry under way, quite rightly, into what happened in terms of the World Cup bid for 2022."