Blatter, whose current mandate ends in 2015, has a vision to expand the game further and should he decide to quit both Michel Platini and Angel Villar are thought to be best placed to take over his role.
The 77-year-old was elected president of soccer's world governing body in 1998 and has until now consistently refused to rule out standing in two years as long as his health permits.
"I will not carry on as long as there is at least one candidate prepared to continue my work," Blatter said.
"The most important thing for me is that the person who takes over FIFA does so with the spirit of globalisation of soccer that we have developed in recent years.
"Michel Platini could be a possible successor as we started together in 1998.
"On the other side is Angel Villar who has had a long career and has good contacts in America and Africa and who would also be a good candidate.
"I don't know if there is a deal between Villar and Platini on these UEFA and FIFA issues but in any case the elections for the FIFA presidency in 2015 will be open and democratic."