Christian Pulisic, the Borussia Dortmund striker has joined Chelsea on a 64m euros (£58m) deal.
okay understands that the player would be loaned back to the Borussia Dortmund until the end of the season.
Pulisic has scored nine goals in 23 games for the US.
“It’s a privilege to have signed for such a legendary club,” Pulisic said.
Michael Zorc, Dortmund director 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.”
Pulisic’s contract at Chelsea is expected to expire in 2020.