Sébastien Haller leaves Dortmund training camp due to testicular tumour

28-year-old forward returns to Germany for further testsHaller complained of feeling unwell at Swiss training campThe Borussia Dortmund forward Sébastien Haller has a testicular tumour and has left his new club’s preseason training camp in Switzerland.In an official statement, Dortmund said that the 28-year-old first complained of feeling unwell at training on Monday. The tumour was found during a medical examination, with Haller returning to Germany to undergo further tests. Tumours can be benign and do not always lead to a diagnosis of cancer.

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