Christopher Nkunku has joined Chelsea on a six-year contract from RB Leipzig.
The two parties are believed to have reached an agreement for some time, with Nkunku's medical taking place in September before personal details were agreed upon in December.
However, the transfer is now official, with the 10-time France international signing a contract that will keep him at Stamford Bridge until 2029.
Nkunku will officially join the Premier League club on July 1, with the transaction believed to be valued over £60 million (£51.3 million).
"I am incredibly happy to be joining Chelsea. A big effort was made to bring me to the club and I am looking forward to meeting my new coach and teammates and showing the Chelsea supporters what I can do on the pitch"
Nkunku told the club's official website.
"Having played in Ligue 1 and the Bundesliga, I now want to play in the Premier League, one of the strongest leagues in the world. I am very excited for this challenge and will be proud to wear the Chelsea shirt"
Chelsea's co-sporting directors Laurence Stewart and Paul Winstanley added
"Christopher has proved himself one of the standout attacking players in European football over the past two seasons and will add quality, creativity and versatility to our squad"
"He has demonstrated his ability at the highest level with RB Leipzig and France and we look forward to him joining up with his new teammates ahead of the new season."
Over the last two seasons, Nkunku has scored 58 goals in 88 appearances in all competitions, assisting Leipzig to back-to-back DFB-Pokal titles.
Last season, he shared the Bundesliga Golden Boot with 16 league goals, and he was also voted Bundesliga Player of the Season and Footballer of the Year in Germany for 2022.
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