The former Ajax forward was optimistic after starting the process of getting well, but the team is being cryptic about whether they will hunt for a replacement.

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Sebastien Haller, a striker for Borussia Dortmund, has finished the first round of his therapy after learning that he had a testicular tumor this week.

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After training on Monday, the former Ajax forward reported feeling unwell. Subsequent testing discovered a tumor,

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Haller tweeted a photo of himself in a hospital bed on Thursday along with a favorable update on his health.

Haller signed a four-year agreement with Dortmund from Ajax earlier this month for an estimated £27 million,

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but his diagnosis has caused the club's transfer plans to fall apart because he will be sidelined for an unforeseen amount of time.

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Although he acknowledged that life without the Ivory Coast international could be difficult for the Black and Yellow,

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Dortmund CEO Hans-Joachim Watzke remained mum on whether the team would hunt for a temporary solution before the transfer window closed.

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"It might be uneven. Watzke said to GOAL Germany on Friday, "But we mustn't use that as an excuse in any way; we have to take it as a challenge.

The midfielder, who has earned 15 caps for the Ivory Coast and scored four goals for them,

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