Willian has suggested that a move away from Chelsea this summer is likely as the two parties are struggling to come to an agreement over a new contract.
The 31-year-old will see his current deal at Stamford Bridge expire at the end of the 2019-20 campaign.
According to the Brazil international, he wants to sign a new three-year contract in London, but Chelsea are only offering a deal until June 2022, which the attacker is not prepared to accept at this moment.
"Chelsea offered me two years, and they are not going to change what they offered," Willian told Esporte Interativo. "I said I wanted three more years. The situation is difficult because of this, I really don't know if it will be possible.
"My goal is to continue working and focus on this remainder of the season, so that Chelsea can continue winning the games for the remainder of the season. I have a clear head and focused for the rest of the season that we have left."
Willian, who moved to the Premier League from Anzhi Makhachkala in August 2013, has contributed five goals and five assists in 34 appearances for the Blues during the 2019-20 campaign.