Graphic: How FIFA's election will work

Seven top officials were among 14 indicted from two criminal investigations into corruption, launched by US and Swiss authorities.

The second case was launched by Swiss prosecutors into the bids for the 2018 and 2022 World Cups, to be held in Russia and Qatar respectively.

FIFA are defiantly pressing on with voting for their next president as planned in Zurich and insist it's "business as usual" for them.

Sepp Blatter, 79, is seeking a fifth term. He has vowed to remain as a candidate, despite the arrests that have left him tarnished by association.

He is being challenged by the Jordanian Prince Ali Bin Al-Hussein, 39. He has been the head of his country's football association since 1999 and is founder of the West Asian Football Federation.

Blatter's insists "his key messages and aspirations are credibility, transparency and fair play."

His philosophy, he claims, is "football for all, all for football."

Prince Ali aims "to shift the focus away from administrative controversy and back to sport", to make FIFA more transparent and distribute earnings more equally.

The new boss will be decided by a secret ballot and all FIFA's 209 member states have a vote each. Members go in alphabetical order, so it will take some time.

In the first round, if either of the candidates wins two-thirds of the vote - a total of 140 votes if everyone takes part - then he wins.

If there is no outright winner at the end of the first round, a candidate would need to win only a straight majority in a second round of voting.

It's also thought that UEFA could call for an extraordinary general meeting of FIFA's congress if Mr Blatter wins today.

If 20 per cent of members agree with the motion, the meeting would have to be held within three months and a motion of no confidence would almost certainly be put forward.