Toni Kroos criticized Jurgen Klinsmann for not teaching him anything during their time together with Bayern Munich.
Kroos came through the ranks of Bayern's youth academy.
"During his time at Bayern I personally missed everything: An idea of how to play football, adequate communication -- and success," said Kroos.
Asked if Klinsmann played a major role in Germany's development that led to winning the World Cup, Kroos said: "It's not true."
Although he's since moved to Spain, Kroos also praised Bayern's current boss, Pep Guardiola.
"He has been the best coach I've ever had in terms of his idea of football, the plan on how to play an opponent, and how to present solutions to his own team," Kroos said.