Christian Pulisic signed for Chelsea this January in a £57.6 million move before being loaned back to Borussia Dortmund for the rest of the season.
The American international has been tipped to replace Willian in the right wing but Chelsea boss Maurizio Sarri will have to wait until the end of the season before working with the 20-year-old.
Chelsea were unable to bring Pulisic to Stamford Bridge this month because of an agreement between Pulisic and Borussia Dortmund.
Speaking to ESPN, Dortmund sporting director Michael Zorc explained why Chelsea had to loan Pulisic back to Dortmund: “We took a collective decision with Christian’s family and his agent that we would transfer him in the summer of 2019 if he didn’t want to extend his contract with us.
“That decision was taken, and it then came to pass over the last few months.”
Zorc also revealed Dortmund had been in discussions with Chelsea to sell Pulisic for some time.
“It wasn’t a case of talks with Chelsea starting at Christmas and being concluded on New Year’s Eve,” said the Dortmund chief.
“This had been going on for weeks if not to say months.”
Zorc also believes Pulisic will be a success at Chelsea.
“He’s a lad who comes with that typically American self-confidence,” Zorc told ESPN at Dortmund’s winter training camp. “Many of his characteristics will help him in England where everything is just little bit more intense than in the Bundesliga.
“He has the pace, he’s got the dribbling, he wants to get ahead at all costs. I don’t know a single reason why he wouldn’t make it there.”
Pulisic has always had ambitions of playing in the Premier League and he believes Chelsea is the best club for him in the Premier League because of the Blues’ style of play under Maurizio Sarri. According to Pulisic, the playing style favoured by Sarri at Chelsea suits him.
“I’ve seen their style of play,” Pulisic said.
“I’ve always appreciated how they’ve played football, and it’s really nice how they play now, with their new coach. It fits me very well.”
Pulisic was also linked with rivals Liverpool but he insists he is happy to sign for Chelsea.
Asked about Liverpool’s interest in him, Pulisic said: “I do not want to talk about that. I am happy to have made my decision for Chelsea.
“My head is now a bit freer. I hope that people understand my decision and also know that I will give everything here [at Dortmund] until the end and want to help our season to be a great one.”