Chelsea manager Maurizio Sarri refused to discuss Willian's future at Stamford amid reports linking him with Barcelona.
The Brazilian international was a summer target for the Spanish champions but the Blues rejected three bids for the winger.
And according to recent reports, the 30-year-old has caught the eye of the Catalan giants once again in the January window.
Willian scored the winning goal in Chelsea's Premier League 2-1 victory over Newcastle in the Premier League.
When asked if Willian's contract which is set to expire in 2020 will extended by a year, Sarri cut him short.
"Stop, stop, stop. I don't know anything about the Willian contract, but I don't know what to answer," Sarri said during his post-game news conference.
"Maybe he has 12 years of contract, I don't know. I don't know the detail. You are trying to let me speak about something I don't know."
Sarri added: "You know very well that Willian is a very important player for us, as I said yesterday in the news conference.
"In my opinion Willian has to stay with us. A very important player, like Pedro. [Callum] Hudson-Odoi is becoming for us a really important player.
"With Eden [Hazard] as a striker, we need wingers. So we need Pedro. We need Hudson-Odoi. We need Willian of course. For us he's fundamental."
However, Willian spoke of the ongoing speculation over his future, telling BT Sport: "My future is Chelsea, I don't know what you're talking about," while fellow goalscorer Pedro added: "Your future is here."
Chelsea will be taking a trip to the Emirates in the next Premier League fixture as they look to extend the gap between themselves and the Gunner who are in fifth.
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