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Published 07:54 19 Jul 2022 BST
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The 28-year-old has now gone back to Dortmund where he will undergo further tests.
"Sebastien Haller had to leave the #BVB training camp in Bad Ragaz due to illness and has already traveled back to Dortmund," a tweet from the club explained. "During examinations, a testicular tumour was discovered."
https://twitter.com/BVB/status/1549136503196078086
Sebastian Kehl, Dortmund's sporting director, said: "This news today came as a shock to Sebastien Haller and everyone else.
"The entire BVB family hopes that Sebastien makes a full recovery as soon as possible and that we can give him a hug again soon.
"We'll do everything in our power to ensure that he receives the best possible treatment."
The Ivory Coast striker scored 34 times for Ajax last season - the best goalscoring season of his career. 11 of his goals came in eight Champions League games, but Ajax were eliminated by Benfica in the last-16 stage.
He moved to Dortmund as Erling Haaland agreed a move to Manchester City.
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