Chelsea have signed Borussia Dortmund winger Christian Pulisic for €64 million (£57.6m).
However, the USA international, whose Dortmund contract would have expired at the end of next season, will not move to Stamford Bridge immediately after the two clubs agreed that the player would remain on loan at the Westfalenstadion until the end of the Bundesliga season.
Dortmund sporting director Michael Zorc said: “It was always Christian’s dream to play in the Premier League. That certainly has to do with his American background, and as a result we were unable to extend his contract.
“Against this background, we have decided to accept an extremely lucrative bid by Chelsea, given the low contract maturity.
“Christian Pulisic is a character-perfect player. I am sure that in the coming months he will do everything in his power to bring his high quality to the team and to achieve his sporting goals with his team-mates at Borussia Dortmund.”
Earlier this week, Chelsea manager Maurizio Sarri had revealed his need for a winger in the January transfer window while defending his use of Bayern Munich target Callum Hudson-Odoi.
Sarri was booed for substituting Hudson-Odoi in the Boxing Day victory over Watford, although it transpired the 18-year-old had felt pain in his hamstring.