“Since I left Chelsea, it’s been a long journey with a lot of ups and downs, but these experiences made me strong and the challenge is to try to help the team win some more trophies.

“I can’t wait to get started and to help the club achieve more success.”

Chelsea transfer chief Marina Granovskaia, who has been working hard to put Tuchel in the best possible position for the coming season, added: “Romelu Lukaku is quite simply one of the world’s best strikers and goalscorers.

“We are absolutely delighted to be bringing him back to the club he loves, and are excited to be adding his talent to our Champions League-winning squad.

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