The new deal doesn’t extend Conte’s commitment to the club, as he already signed a three-year contract when he arrived in west London in the summer of 2016.
The improved contract is worth £9m a year.
“I am very happy to have signed a new contract,” said the Italian, 47.
“We worked extremely hard in our first year to achieve something amazing, which I am very proud of. Now we must work even harder to stay at the top.”
The decision to sign a new contract without extending the terms runs counter to previous comments by Conte, who had indicated his willingness to commit to a longer deal.
Speaking in May, he said he wanted to stay with Chelsea “for many years”, adding: “If the club give me the possibility to stay and extend my contract, for sure I’m available to.”
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