The Mail on Sunday reported FIFA would no longer allow investors to purchase teams under the name of a business, while they themselves remain anonymous.

The report comes amid disquiet in England over the possible takeover of West Ham, with uncertainty over who exactly is bankrolling a bid believed to be led by Iranian-born businessman Kia Joorabchian.

Under guidelines expected to be adopted by FIFA, those behind the West Ham bid would not be allowed to keep their identities secret.

The report said UEFA treasurer and Dutch football association president Mathieu Sprenger was recently asked by FIFA to launch an investigation into investment funds and mystery backers buying into football clubs.

Sprenger warned whoever the West Ham bidders are that they will soon have to make themselves known if any takeover is completed.

"I have heard about the news reports concerning West Ham. Our proposals are that all clubs must show who owns them," Sprenger told the Mail on Sunday.

"It will not be enough simply for them to show that a company owns them. They will have to show who is behind that company as well.

"The FIFA congress unanimously supported these proposals in July so there is support from all the confederations for this.

"The FIFA president (Sepp Blatter) wants them to be written at the Congress next July.

"It doesn't matter if a takeover happens before the rules are instituted - from next year all clubs would have to show their ownership and who is behind them. "If (Joorabchian) took over at West Ham, he would have to show that.

"For the integrity of competitions, it has to be made clear who is in control."