The 34-year-old has put pen to paper on a one-year deal with the newly-promoted side after terminating his contract with Corinthians.
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“I’m happy to be here, I’m happy to be back in the Premier League,” he said in a statement.
“Fulham is a special club, a club that wants to improve, that wants to fight for something bigger, so I’m here to help, and I cant wait to get started.”
Willian returns to the English top-flight after terminating his deal at Arsenal in August 2021 to return to his native Brazil.
However, sources told ESPN Brasil that he made up his mind to leave Corinthians a month ago and has now sealed a return to English football.
Willian’s first stint in England started in 2013 when he joined Chelsea and, he went on to win two Premier League titles, an FA Cup and a League Cup at Stamford Bridge.
At the start of the 2020-21 campaign, he joined London rivals Arsenal on a free transfer but endured a difficult spell, scoring once in 25 appearances.
Fulham will be hopeful his top-flight experience can keep them in the league after winning two and drawing two of their opening five matches.