The tournament is the brainchild of Michel Platini, the UEFA president who could be Blatter's rival for FIFA presidency in 2015. Rather than staging the championship in one or two host countries, UEFA has spread the 2020 edition around the continent, with the semifinals and the final to be played in one stadium. The hosts have not been decided yet.
"A tournament should be played in one country, that's how you build identity and euphoria," Blatter told Germany's Kicker magazine in an interview published Thursday. "The 2020 tournament has been fragmented.
"It's not a European Championship anymore. It should be called something else — I don't know what. Such a European Championship lacks soul and heart."
Blatter did not rule out running again in 2015, although the 77-year-old Swiss says he is also ready to hand over the reins to someone else. He has headed FIFA since 1998 and has been equivocal on initial intention not to run again.
"I want to push through the FIFA reforms at our congress in Mauritius in May, then we go to Brazil for the World Cup in 2014, and after that everything is open," Blatter said. "When it is sure that FIFA will continue to be guided like that, that it will remain global and the pyramid will not collapse, then I will gladly hand over the scepter to a new president."
Asked if he could rule out running in 2015, Blatter said: "What can you rule out, when you don't exactly know what the future will bring."
Platini is also a FIFA vice-president.