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Although Appiah says that the ex-AC Milan star could return to the national team in the future, Heldt feels that Boateng has played his last game for his country.
"We have seen at Schalke that he is as an absolute team player," he told Bild. "I can't imagine that he will run out for Ghana again.
"I am sure that this World Cup and the suspension will not burden him. Quite the contrary, anyone who knows Boateng knows that all this will motivate him more."
Ghana tumbled out of the World Cup prior to the knockout stages after losing to United States and Portugal, despite a thrilling 2-2 draw with eventual group winners Germany.