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The football world was shaken by the news about Borussia Dortmund's newcomer Sebastien Haller's health. On Tuesday, it was announced that the 28-year-old footballer has been diagnosed with testicular cancer. S. Haller felt unwell during training on Monday, and the tests showed a tumor in the footballer's testicles. The Ivory Coast national team player only joined BVB this summer to replace Erling Haaland.