Willian has assured Chelsea fans he wants to stay at Stamford Bridge, amid speculation of a possible reunion with his former boss Jose Mourinho at Manchester United.
The 29-year-old has not been a regular starter this season but marked his return to the side with a match-winning display in Tuesday night's 3-1 win at Huddersfield, scoring his second league goal of the season.
Watch Chelsea TV free this Christmas!
Christmas comes early for Chelsea fans. Watch Chelsea TV for free from December 8-18 on Sky channel 421. Find out more.
"I'm happy here and the fans can be calm," Willian said.
"I'm always happy here at Chelsea. I really like this club a lot with my heart. Yeah, I'm very happy."
Willian has been repeatedly linked with a move to title rivals United after growing frustration over his lack of game time under Antonio Conte.
The Brazil international has started only 12 games this season, but responded to his recall by heading home the second and laying on both Chelsea's other goals for Tiemoue Bakayoko and Pedro.
"Of course I'm very happy," he said. "When I play, I always try to do my best to help the team to score goals to make assists and I did that with my team-mates."
Chelsea bounced back from Saturday's defeat at West Ham by finally producing a display worthy of champions against Huddersfield.
Conte repeated his assertion afterwards that the title race was over - leaders Manchester City moved 11 points clear with a 4-0 victory over Swansea - but Willian is not giving up on Chelsea's defence of their Premier League crown.
"Like I said, we have to fight until the end. It's a big gap, but we have to fight until the end. We have a lot of games," he added.
"In football anything can happen. We have to fight. We will never give up, we have to continue.
"We have to think about us and our performance and forget the others. We are Chelsea, a big club, and we always want to win."