Fifa is liaising with informers inside organised crime syndicates to prevent match-fixing and betting plots.

World Cup qualifiers between nations unlikely to reach Brazil 2014 are believed to be at the greatest risk.

Up to 50 active national investigations, involving a quarter of Fifa's member associations, are currently ongoing.

"That's frightening," said Fifa security director Chris Eaton. "Let's do something about it and fight back."

He added: "Match-fixing can and does impact on qualifiers for Fifa competitions, and could impact on the global events themselves.

"What we're doing now is developing sources both in criminal organisations and football that will advise us."

Fifa will open a hotline for whistleblowers in February, offering rewards for information at the start of a three-month campaign.

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