German giants Borussia Dortmund are set to play hardball on transfers with Premier League clubs.
BVB have put in an opening bid worth £21.3 million for loanee Ian Maatsen this week.
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While Chelsea are willing to sell Maatsen, they are seeking a much higher fee.
Transfer specialist Fabrizio Romano states that this will be the beginning of negotiations.
Both parties are hoping they can come to a conclusion, but Dortmund are prepared to walk away.
They are also likely to seek talks with Manchester United about loanee Jadon Sancho.