The Daily Express is reporting that the Brazilian has agreed to sign an extension to his current deal with the Blues to keep him at the club for another year and until 2021.
The 30-year-old is set to link up with the Blues squad in the coming days after playing a role in helping Brazil to win the Copa America this summer.
According to the same story, Frank Lampard had wanted to assess Willian before making a decision about a new deal, but the club have seemingly moved quickly to tie up the deal anyhow.
Willian scored three goals and made six assists in 32 Premier League games for Chelsea FC under Maurizio Sarri last season.
The Brazil international will clearly be keen to play an important role in the Chelsea FC team under new boss Lampard in the forthcoming campaign.
The Blues will commence their Premier League season with a tricky trip to Old Trafford to take on Manchester United on 11 August.
The west London side finished in third place in the Premier League table and lifted the Europa League trophy last term.
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