London, United Kingdom: The international professional footballers union FIFPRO on Friday called for the "most stringent tests of integrity" to be applied to candidates for the presidency of scandal-tainted FIFA.

With the deadline for candidates looming on Monday, FIFPRO gave a clear indication that it believes only a candidate from outside FIFA can lead football's global governing body out of its current crisis.

With FIFA's outgoing president Sepp Blatter and the leading candidate to take over, Michel Platini, both now suspended, FIFPRO said: "There is no doubt the present mayhem has left FIFA morally bankrupt."

The union has already declared that it has "no confidence in FIFA’s ability to reform from within."

"A clean break from the past is essential for FIFA to climb out of the toxic pit which continues to produce serious accusations of corrupt behaviour on almost a daily basis," said a statement which sets out the organisation's criteria for candidates.

The players' union said any replacement for Blatter elected on February 26 would need experience to "drive reform" of a "politically complex global body", experience of governance and human rights, and understanding of football as a sport and business.

"Suffice to say, the future leader of FIFA has to be a proven reformer, an impeccable figure who passes the most stringent tests of integrity, carried out independently, possibly by more than one external body," said FIFPRO.

"Eliminating even the slightest perception of conflict of interest will be a critical part of a robust reform process, as opposed to the charade of self-regulation that has damaged the image of the world’s most popular sport."

France football great Platini is suspended because of a Swiss criminal investigation into a two million dollar payment he received from FIFA in 2011. He said he has still registered as a candidate.

The other contenders who say they have officially registered with the backing of five national associations are Prince Ali bin al Hussein, a former FIFA vice president from Jordan, and Trinidad and Tobago captain David Nahkid.

Shaikh Salman bin Ebrahim al Khalifa, president of the Asian FootballConfederation from Bahrain, is expected to announce he is running before Monday's deadline.

Others including Jerome Champagne, a former FIFA official, could follow.