"It's difficult," Willian told BBC's Football Focus. "Manchester City are playing very well but I think we can fight for the title until the end."
Manchester United and Tottenham Hotspur are second and third respectively, a point ahead of Antonio Conte's men.
"It is difficult to play when you were champion last season and to fight for the title again as every team wants to win against Chelsea," added the Brazil international.
Chelsea travel to West Bromwich Albion, who are 16th in the league, on Saturday.
(Reporting by Aditi Prakash in Bengaluru; editing by Sudipto Ganguly)
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