Willian says he intends to stay at Chelsea, and confirmed Barcelona made a bid to sign him.
The Brazil winger, 29, has been at Stamford Bridge for five years but was linked with a move this summer.
"The only club I knew that really made an official offer for me was Barcelona."
He has also been linked to Manchester United and Real Madrid - who are also reportedly interested in Blues duo Thibaut Courtois and Eden Hazard.
Willian added: "I have my head here and I intend to continue in the club unless the club wants to sell me."
New Chelsea manager Maurizio Sarri has only signed two players this summer - Napoli midfielder Jorginho and back-up goalkeeper Rob Green.