According to Sky Sports, the Brazilian forward wants to make a 180 degree turn on his move to the Emirates last summer.
Willian signed for Arsenal in August as a free agent, having failed to strike a contract agreement with Chelsea.
The Gunners offered him a three-year deal, but his race might have been run after just one season.
In hindsight, the transfer across London was a very ill advised one for the 32-year-old.
He scored just once in 37 appearances for Mikel Arteta’s side and wasn’t picked for the final three Premier League games.
Resigning for Chelsea would be one of the strangest deals in modern times.
However, Willian would probably be met with quite a warm welcome upon his re-arrival at Cobham.
There was a lot of love for the attacker during and after his spell with the Blues.
John Terry posted an emotional Instagram story shortly after Willian joined Arsenal, calling him an ‘absolute legend’ and a ‘great player’.
During his seven years at Chelsea, the tricky wide man won two league titles, an FA Cup and League Cup, the Europa League and was twice named the Player’s Player of the Year.
Stranger things have happened in football, but this would certainly be up there with the weirdest.