British Prime Minister David Cameron thinks the workings of football's governing body FIFA are "murky", The Times newspaper quoted a Downing Street source as saying Saturday.

The battle for the FIFA presidency has been thrown further into turmoil as the Zurich-based body announced they have opened a probe for alleged corruption against president Sepp Blatter.

"The prime minister has made clear in public and private that he believes the workings of FIFA have become rather murky", a Downing Street source told The Times newspaper.

Blatter will appear before FIFA's ethics committee on Sunday after claims he knew about alleged cash payments at the centre of an investigation targeting his election rival Mohamed Bin Hammam.

The Qatari had demanded the corruption investigation be widened to include Blatter on Thursday as the two men prepare to contest a June 1 election for control of world football.

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