Joachim Low has warned Germany that Cameroon are dangerous opponents as they look to secure a place in the Confederations Cup semifinals on Sunday.
Germany need just a point from the encounter in Sochi, but Cameroon can advance if they win by two clear goals.
"Cameroon have nothing left to lose," Low told a news conference on Saturday. "They can only advance if they win.
"Tomorrow will be one of the most challenging and physically intensive games. When you see how fast they play, what pace they have in their players in attack, this mixture is not seen often. They are so persistent and fast."
In a bid to counter that pace, Low said he intended to restore Roma defender Antonio Rudiger to his back four.
"I had already planned this because Cameroon have such crazy quick players," he said. "These are also Rudiger's strengths with his strength and his speed."
That will be one of a number of changes, although Low cautioned against wholesale alterations to his starting lineup with qualification not yet secure.
"I cannot change too much," he said. "I cannot swap seven or eight because the basic structure must remain. But four or five changes are conceivable."
Low has never failed to reach the semifinals of a major tournament since taking charge of Germany.
Cameroon, meanwhile, have never beaten Germany in their three previous meetings.