Sky Deutschland says Ryerson could leave Dortmund for the Premier League this summer.
There is interest from several English clubs, not least Aston Villa and Brighton.
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Dortmund bought Ryerson for as little as 5m and he is among the lowest paid players in the squad.
Dortmund may offer an extension with a substantial salary increase. However, Dortmund could be ready to sell the 26-year-old if a good offer arrives this summer.