Asia's top sports leaders on Friday refused to back Prince Ali bin Al Hussein's election challenge to FIFA president Sepp Blatter and insisted it is doomed to failure.

Asian Football Confederation (AFC) chief Shaikh Salman bin Ebrahim Al Khalifa told AFP there would be no reversal of the regional body's previous commitment to back Blatter.

He said all 46 AFC member associations were behind the controversial world soccer chief, despite the Jordanian royal's status as an AFC vice-president.

"We made it clear where Asia is heading in the next FIFA election and the 46 countries have committed to Joseph Sepp Blatter to take a fifth term, so nothing has changed," he insisted. "We never change our commitment."

Shaikh Salman said he was stunned to hear of Ali's decision, announced this week, to stand against Blatter in the May election.

"I was surprised to see it in the press," he said, following an AFC extraordinary congress in Melbourne before the start of the Asian Cup.

"If there is a candidate from Asia, Asia has to push for it. It's not the way around that somebody can nominate themselves without consulting the Asian confederation.

"At the end of the day, you will need the backing of the confederation."

Ali, 39, a FIFA vice-president and also head of the West Asian Football Federation, was one of several officials who called for the publication of ethics investigator Michael Garcia's report into allegations of corruption surrounding the 2018 and 2022 World Cup bids.

But Olympic Council of Asia (OCA) boss Sheikh Ahmad Al Fahad Al Sabah warned that Ali risked upsetting the unity of member nations across the region.

He predicted the Jordanian would struggle to win "10 to 15 percent of the votes" in the May 29 election, and suggested he reconsider his bid.

"I hope Prince Ali or any other candidate will think a thousand times before making his calculation," said the Kuwaiti.

"He has the right to continue, but we wish to show our solidarity in the football family-and solidarity is needed more than ever in this organization during (a time of) the Garcia file and stories of corruption."