The young German has been a long-term target for Newcastle and Manchester United.
Sky Deutschland says Adeyemi's future is uncertain after he changed agents.
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There are said to have been some informal enquiries from English clubs and Dortmund are open to selling this summer, if the right bid comes through.
The 22-year-old has scored five goals and provided two assists in 33 competitive games this season, 18 of which were starts.