Victory for Chelsea leaves them 11 points adrift of runaway leaders Manchester City, who play their game in hand against Swansea City later today, but Willian insists that no gap is too big for the defending champions.
"I think we had a great game, we had possession and tried to play the ball," he told BT Sport. "We created a lot of chances and we have to carry on.
"Always when I play I want to play well and make a difference. Of course I want to play every game, but only 11 can start. We know it's difficult [to win the title], but we have to fight until the end. We are Chelsea, we are a big club – we have to fight."
Willian has now played a direct part in five goals in 17 Premier League appearances this term, just eight of which have been starts.