RB Leipzig sporting director Max Eberl has declared Christopher Nkunku will move to Chelsea this summer.
The two clubs reached terms before Christmas.
And Eberl, speaking to BILD, said: “The signs are very, very clear that he's moving to Chelsea."
Nkunku moved to Germany from Paris Saint-Germain in 2019 and has since emerged as one of Europe's leading attackers.
The west London giants were eager to steal a march on rivals for Nkuku's signature, and duly moved quickly outside of the transfer window by agreeing to pay more than his £53m release clause, which actives this summer, to ensure they won the race.
The France international has won a raft of individual awards since moving to the Bundesliga after scoring 64 goals while laying on a further 51 assists in 159 appearances.