Chukwuemeka, 21, spent the second half of last season on loan at Dortmund and is set to sign on a permanent basis for a fee rising to about £24m, with a significant sell-on clause included.

The England Under-20 international was keen to move back to the Westfalenstadion despite interest from RB Leizpig and is in the process of finalising his return.

That deal would take Chelsea’s income from player sales this summer to a league-high £273.4m, which almost balances out the £277m spent on incoming transfers.

Uefa have told Chelsea they must record a positive transfer balance this window in order to be allowed to register their new signings for this season’s Champions League.

It follows them having been fined £26.7m for a breach of Uefa’s football earning rules and having had a squad cost ratio – the proportion of their income paid out in wages – above 80%.

Meanwhile, Anselmino has agreed to join Dortmund on a season-long loan deal without any option to buy clauses included.

The Argentine defender was told by manager Enzo Maresca that he needed a loan move to play the minutes he needs to develop amid competition for places in the Chelsea first-team squad.

But he remains an important part of future planning at Stamford Bridge, and moves to Dortmund to cover the recent injuries of defenders Niklas Sule, Emre Can and Nico Schlotterbeck.

Chukwuemeka has played 32 matches for Chelsea since joining in a £20m move from Aston Villa in 2022, while Anselmino made a single substitute appearance at the Club World Cup having joined the west Londoners from Boca Juniors in January for £15.6m.

Chelsea hope to sign to more players in the nine days remaining in the window, with Manchester United winger Alejandro Garnacho and RB Leipzig midfielder Xavi Simons targeted.

Forwards Nicolas Jackson, Christopher Nkunku and Tyrique George are expected to leave, while Chelsea could sell as many as nine players, including in the so-called ‘bomb squad’, with the Blues looking at options for Raheem Sterling, Ben Chilwell, Axel Disasi amongst others.

Chukwuemeka, 19, sustained the injury in Chelsea’s 3-1 defeat by West Ham in which he scored the Blues’ only goal.

A £20m summer signing from Aston Villa, he started in Chelsea’s first two Premier League games of the season.

“Bitter sweet feeling scoring my first goal for Chelsea but picking up an injury and not coming home with three points,” Chukwuemeka said.

“Minor setback but I’ll be back very soon. Thank you Chelsea fans for your love and support.”

Confirming Chukwuemeka had undergone surgery, Chelsea added the player would now begin rehabilitation, working with the club’s medical department at their Cobham training facility.

Earlier in the week the Blues had announced that they had reached an agreement with Villa for the deal. Whilst the terms of said deal weren’t disclosed the fee was reported to be £20 million fee.

Now Chelsea have put out another statement saying that the deal has been completed following the agreement of personal terms with Chukwuemeka.

The midfielder, who helped England win the Euro U19s, will sign a six-year deal.

“It’s been quite hectic but I couldn’t get Chelsea out of my head the last few days so I’m just happy and relieved that it’s all done,” said Chukwuemeka to the club’s website after the deal was finally completed.

“I’m so excited and just can’t wait to get on the pitch, meet all the players and try to win games and trophies with Chelsea.”

Chelsea chairman and co-owner Todd Boehly added: “Carney is one of the most exciting young players in Europe so we are really looking forward to seeing him in action at Stamford Bridge.

“We are delighted to be able to bring him to Chelsea and add such a talented young individual to our squad for the new season and beyond.”

Chukwuemeka becomes Chelsea’s fourth signing of the summer after the arrivals of Raheem Sterling, Kalidou Koulibaly and Gabriel Slonina.