The 22-year-old left-back was part of the Borussia Dortmund team beaten by Real Madrid in last season’s Champions League final during a loan move from Stamford Bridge.
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Now, the deal has been completed after Chelsea announced on Saturday morning that the 18-year-old has penned a six-year-deal, with the option of an extra year, in west London.
Premier League clubs warned as Chelsea criticised for 'swap deals'
The Premier League have written to all 20 clubs warning of punishments over potentially fraudulent 'swap deals' between each other this summer.Chelsea, Aston Villa and Everton have all been...