Chelsea have confirmed the signing of American winger Christian Pulisic in a £58 million deal from Borussia Dortmund.

The Blues will loan Pulisic back to the Bundesliga outfit for the remainder of the 2018-19 season.

It represents a major deal for Maurizio Sarri, who recently expressed his desire to sign a new winger.

Pulisic’s rise has been mightily impressive and it will be very interesting to see how he fares in the Premier League.

The United States international said: "It’s a privilege to have signed for such a legendary club and I look forward to working hard towards being a contributor to their team of world class players,” per the Evening Standard.

"[I am] looking forward to working with Maurizio Sarri and his technical team."

There was a point when Liverpool appeared to be the favourites to sign the 20-year-old, particularly when Jurgen Klopp raved about him in July 2018.

Why Liverpool didn't go for Pulisic

"I like Christian, I've known him since he was a kid,” the former Dortmund boss told Sky Sports. “He's still not really old, he's a fantastic player, and it's deserved people think highly of him in America.”

So, why is Pulisic heading to Stamford Bridge and not to Anfield?

According to Dean Jones of Bleacher Report, Klopp determined that it would be difficult for the American to get into Liverpool’s setup, such is the quality of his squad right now.

Indeed, Klopp has many options in the advanced positions. Behind Mohamed Salah, Roberto Firmino and Mohamed Salah, Xherdan Shaqiri is proving to be a revelation and Alex Oxlade-Chamberlain’s recovery from his injury is going well.

So it’s hardly surprising that Klopp decided it wasn’t worth pursuing Pulisic, despite his high opinion towards him.

Pulisic’s contract at Dortmund was set to expire in June 2020 and the German club felt it was right to cash in now.

"It was always Christian's dream to play in the Premier League,” BVB director Michael Zorc said, per BBC Sport.

"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."