Rio de Janeiro, Sep 29 (IANS): Brazil legend Ronaldo has said he expects "many people will fall" as a result of a worldwide probe into corruption in football.

Ronaldo said he had "always heard a lot" about shady deals in the game and urged authorities to act swiftly to identify crooked officials, reports Xinhua.

"When you are involved in football, you hear about what goes on," the former striker said on MOnday.

"It doesn't surprise me that the system has fallen on a global level. It's time to make things more transparent. Many people will fall. It is important that the authorities find out more about this (corrupt) network. We hope that football can once again be pure."

Ronaldo's comments come three days after Swiss authorities opened criminal proceedings against FIFA president Sepp Blatter.

The 79-year-old Swiss is accused of signing a contract that was "unfavorable to FIFA" and making a "disloyal payment" to UEFA president Michel Platini, who has also been questioned. Blatter and Platini denied any wrongdoing on Monday.

In May, the US department of justice indicted 14 current and former FIFA officials on charges that included racketeering, wire fraud and money laundering.

Swiss authorities are also investigating the bidding process for the 2018 and 2022 World Cups, to be held in Russia and Qatar.

The scandal has had major repercussions in Brazil, where a congressional inquiry is looking into claims of graft within the country's football confederation (CBF).

Among those being investigated is CBF president Marco Polo Del Nero, who replaced Jose Maria Marin as head of the confederation in April.

Del Nero raised eyebrows in May when he unexpectedly returned to Brazil from Switzerland just hours after Marin was arrested in Zurich as part of the US probe.