Bierhoff: Concentrate on Ghana, not Boateng

Boateng, whose half-brother Jerome is in the Germany squad, was responsible for dashing captain Ballack's World Cup hopes when his tackle during the English FA Cup final in May ruled the 33-year-old out of the tournament with an ankle injury.

"I do not think it would be right for us to use our emotions or feelings and channel them against a single person," Bierhoff said.

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