The poll is seen as crucial to repairing the organisation's reputation, which has been battered by a series of unprecedented corruption scandals, but just two days before the vote, protests over the secrecy of ballots have mounted.

Front-runners Infantino, the Swiss-Italian acting chief of European football and Sheikh Salman of Bahrain, Asian football president, have so far stayed clear of the controversy over balloting.

Both were in FIFA's home city of Zurich trying to assemble the coalition of supporters needed to replace the disgraced Sepp Blatter and win the most powerful job in world football. But rival candidate Prince Ali bin al Hussein of Jordan has appealed to the Court of Arbitration for Sport (CAS) to suspend Friday's election.

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