The 29-year-old has been the subject of a lot of interest during the summer transfer window, with Mourinho believd to be keen to reunite with the player.
Chelsea have turned down multiple bids from the Catalan giants Barcelona, and now Willian has opened up, talking about his happiness with life in London.
Willian spoke to Globo Esporte, and was honest when asked if he would be moving away from the Blues.
"[Leaving?] No, I'm back to England. I'm very happy at Chelsea," the forward said.
"I'm very happy living in London."
Willian looked set for a move since the end of the season, when the rift with Antonio Conte became even clearer.
However, Willian is set for a new era at Chelsea, following the arrival of Maurizio Sarri.