Pierre-Emerick Aubameyang has penned a two-year contract with the Blues.
The former Arsenal captain has joined Stamford Bridge on a two-year deal on the final hour of the deadline day.
Chelsea have paid £12m for his services to Barcelona and Auba is expected to lead the line very soon.
He joined Barcelona on a free transfer from Arsenal last January and scored 13 goals in 24 appearances for the Catalan giants.
With Timo Werner and Romelu Lukaku leaving this summer, the 33-year-old striker will be key in Chelsea’s final third this season.
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Barcelona said in a statement: “FC Barcelona and Chelsea Football Club have reached an agreement on the transfer of Pierre Emerick Aubameyang for 12 million euros.
“FC Barcelona publicly expresses its gratitude to Aubameyang for his professionalism, commitment, dedication and ever-present positive and warm approach regarding every aspect involving the Club. We wish him the best of fortune and every success in the future. Your smile radiated happiness both on and off the pitch, thank you. Barça will always be your home.”