Blatter said Saturday on Germany's Focus weekly that the dramatic change would make the tournament more interesting. He says the change could involve going to a shootout after 90 minutes of regulation or adding sudden-death overtime.
Sudden-death overtime was used in the knockout rounds of the 1998 and 2002 World Cups. FIFA then reverted to its previous rule of having teams play a full 30 minutes of overtime if tied at the end of regulation in the knockout rounds.
First-round games have always ended in draws if tied at the end of regulation.