Ballack said Germany urgently needed to bolster their defence in their final World Cup warm-up match on Friday against Colombia even if that meant a dull match for the spectators.

"We talk a lot and he knows my views," Ballack said when asked about an interview in which he appeared to contradict his coach by calling for an end to experiments.

"We don't need to talk every day. He's the trainer and sets up the system that he wants us to play.

"By and large we're in agreement. On some points we have different views. If everyone expressed their opinions aloud all the time we'd have chaos."

Klinsmann has come under renewed attack in Germany after fellow World Cup qualifiers Japan took advantage of poor defence to build a 2-0 lead on Tuesday before the hosts equalised late in the warm-up game.

It recalled their 4-1 drubbing by Italy in March and prompted new calls for Klinsmann to install a sweeper in front of the defence, something Ballack said was unlikely to happen.

"We saw against Japan that we have not yet improved the weaknesses we've had in defence in the last two years under Juergen Klinsmann," he said.

"That's the risk of this philosophy but we cannot afford to play at all-out risk."