The French coach revealed on the French Football Federation (FFF) website that he was confident the 23 players he had with him at this ski resort would perform well at the finals, which run from 11 June to 11 July.
"We thought about it [calling up a replacement for Diarra] a long time," said Domenech, who had originally had 24 players at the camp until Diarra fell ill. "However, we are placing our confidence in the 23 players here at Tignes, who are really hungry to go to the World Cup finals, and show us that every day," he said.
Diarra had been ruled out of the finals on Saturday after being diagnosed with an intestinal illness. Diarra joined Real Madrid from Portsmouth in January 2009, having previously played for Chelsea and Arsenal.
With Lyon's Jeremy Toulalan he forms Domenech's first-choice defensive midfield partnership and he played in 10 of France's 12 matches in their 2010 World Cup qualification campaign. Arsenal's Abou Diaby played in his position in France's training session on Saturday afternoon.
Les Bleus begin their World Cup campaign against Group A rivals Uruguay in Cape Town on 11 June.
Goalkeepers: Hugo Lloris (Lyon), Steve Mandanda (Marseille), Cedric Carrasso (Bordeaux)
Defenders: William Gallas (Arsenal/ENG), Eric Abidal (Barcelona/ESP), Bakary Sagna (Arsenal/ENG), Patrice Evra (Manchester United/ENG), Gael Clichy (Arsenal/ENG), Marc Planus (Bordeaux), Anthony Reveillere (Lyon), Sebastien Squillaci (Sevilla/ESP)
Midfielders: Abou Diaby (Arsenal/ENG), Alou Diarra (Bordeaux), Yoann Gourcuff (Bordeaux), Florent Malouda (Chelsea/ENG), Jeremy Toulalan (Lyon)
Strikers: Nicolas Anelka (Chelsea/ENG), Djibril Cisse (Panathinaikos/GRE), Andre-Pierre Gignac (Toulouse), Sidney Govou (Lyon), Thierry Henry (Barcelona/ESP), Franck Ribery (Bayern Munich/GER), Mathieu Valbuena (Marseille)
*Please note that squad lists only become official after they have been submitted to and announced by FIFA.