No team fears South Africa at the World Cup, according to Jake White, the man who guided the Springboks to the title in 2007.
South Africa lost 34-32 to Japan in Pool B last Saturday in the biggest upset in international rugby history.
"We have become an ordinary team," White told French sports daily L'Equipe on Tuesday.
"Nobody fears us anymore. [Pool B rivals] Scotland have started to fancy their chances and it worries me."
White, who now coaches French Top 14 side Montpellier, added that South Africa's mistake was that they had underestimated Japan.
"The Japanese were perfectly organised, they had a plan. The Springboks, instead, thought that simply turning up on the field would be enough.
"Apparently nobody knew what to expect against Japan, nobody knew the Japanese players. Yet we have guys like Fourie Du Preez who play in Japan. Have we asked them information? I don't think so.
"I don't want to lack respect towards [Japan coach] Eddie Jones or the Japanese team but this defeat should never have happened.
"Rugby is our national sport, our players have known each other for a long time. We'd known for three years we'd be facing Japan."
South Africa now take on Samoa on Saturday and Japan face Scotland on Wednesday. The United States are the other team in Pool B.