The Spanish winger is remaining positive despite the Blues sitting ten points behind league leaders Manchester City and feels that they are good enough to turn around their poor form against the bigger clubs so far this campaign.
"There are so many weeks until the Premier League finishes and we will keep going every week to win and to be closer to first place," he told the Evening Standard.
"Have we answered the critics? Yes, with the win against Valencia and the last game at Newcastle. These two games have given us more confidence and we have to train this week very well to play against City. That is a very important game for us as well.
"We want to change our record in the big games this season because we lost against Liverpool (2-1 loss), Arsenal (5-3 loss) and Manchester United (3-1 loss) but we hope against Manchester City we change this bad thing.
"City are having a great Premier League. They are the leaders, they win every game, but we hope here at Stamford Bridge they will have a difficult game.
"Is it a game we can't afford to lose? I don't know. We hope to win, that is all we are thinking about. We never think about losing."