The 31-year-old, who can also operate as an attacking midfielder, has been at the Blues since 2013 and is out of contract at the London club at the end of the season.
Mourinho worked with the Brazil international when he was the manager of Chelsea, and the former Manchester United boss spoke highly of the former Anzhi Makhachkala star in February 2018.
Mourinho told The Independent about Willian after United’s match against Chelsea in February 2018: “Do you want to talk about Willian? Top, cream of the crop, he’s amazing.
"In his national team there’s no bad players. The Brazil manager (Tite) is really good with huge club experience. You guys will do great things in Russia.”
Tottenham Hotspur transfer?
Tottenham and Chelsea are bitter rivals, and with both the London clubs aiming to finish in the top four of the Premier League table this season, it is hard to see the Blues sanction a transfer.
According to WhoScored, Willian has scored four goals and provided four assists in 20 Premier League matches, and has scored one goal and provided one assist in six Champions League games for Chelsea so far this season.
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