World Cup organizers are investigating if an Italian man fraudulently received a disabled access ticket before running onto the field during the United States-Belgium match.
Mario Ferri ran across the field in Salvador on Tuesday, delaying play for about a minute in the first half.
He did the same thing at the 2010 World Cup, during a semifinal match between Spain and Germany, after entering the stadium in a wheelchair.
Brazilian organizing committee spokesman Saint-Clair Milesi says "we are checking how he had the access."
Milesi says if Ferri showed false papers at the stadium claiming to have a disability then "that is even more serious" than running onto the field.
FIFA spokeswoman Delia Fischer says official ticketing lists for the match did not include Ferri's name.