World football's governing body, embroiled in a corruption scandal that has led to indictments against several dozen senior officials in the United States, will vote for its new leader on Feb. 26.
Blatter is not standing, having been banned for eight years for ethics violations.
"Four of the five candidates have spoken to me. I cannot take sides, that is not possible," Blatter told French radio RMC.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
He said several national federations had asked him who they should vote for, but he told them to vote as they saw fit.
Bahraini Royal Sheikh Salman bin Ebrahim Al Khalifa and UEFA general secretary Gianni Infantino of Switzerland are the two front-runners.
The other candidates are Jordan's Prince Ali bin Al Hussein, Frenchman Jerome Champagne, the former deputy general secretary of FIFA, and South African businessman and politician Tokyo Sexwale.
(Reporting by Geert De Clercq; editing by John Stonestreet)
