In total, around five million euros will probably flow to parent club Manchester United.
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Sancho returned to BVB from United in January after a dispute with United manager Erik ten Hag.
The 24-year-old winger has been particularly impressive in the Champions League since then, so Dortmund can certainly cope with the additional payment of around 1.5 million euros.
What's more, the black and yellows are hoping to sign Sancho permanently.