The 24-year-old has agreed on personal terms with the Blues and will remain at the German club for the rest of the Bundesliga season. He will link up with his new team-mates in July, subject to passing a medical examination.
One of the most feared young strikers in Europe, Werner is renowned for his pace, movement, link-up play, and finishing ability. At Leipzig, he has most often been deployed in a front two, but he can also play out wide in a front three or as the central striker.
Werner said: ‘I am delighted to be signing for Chelsea, it is a very proud moment for me to be joining this great club. I of course want to thank RB Leipzig, the club and the fans, for four fantastic years. You will forever be in my heart. I look forward to next season with my new team-mates, my new manager and of course the Chelsea fans. Together we have a very successful future ahead of us.’