Mexico's Benito Armando Archundia will be the man in the middle for Saturday's third-place game between Uruguay and Germany in Port Elizabeth.
Englishman Howard Webb will officiate Sunday's final in Johannesburg, in which the Netherlands or Spain will win its first World Cup title.
Archundia, 44, was in charge of two first-stage matches in South Africa: Italy's 1-1 draw with Paraguay and Brazil's scoreless tie with Portugal. He also officiated five games at the 2006 World Cup, including Italy's 2-0 overtime triumph over host Germany in the semifinals.
Webb, 38, has refereed three matches in the tournament: Spain's loss to Switzerland and Italy's loss to Slovakia in group play and Brazil's round-of-16 victory over Chile.
The South Yorkshire police sergeant, who took a five-year leave of absence to concentrate on his refereeing duties, has been calling games since 1995 and became an English Premier League linesman in 1998 and full referee in 2003. He gained FIFA status in 2005 and officiated at the 2008 European Championship.