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Bayern Munich's Michael Ballack (l) and teammate Robert Kovac walk off after victory over Celtic Stock Photo - Alamy
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Ex-Germany, Chelsea and Bayern Munich midfielder Michael Ballack announces retirement | Football News | ESPN.co.uk
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Michael Ballack's teenage son Emilio killed in quad bike incident in Portugal on Thursday | Football News | Sky Sports
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Chelsea send message of support as Michael Ballack's son, Emilio, tragically dies aged 18 - football.london
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