The Blues have been competing in three cup competitions since the end of January, and while Luiz admits that all their matches are important, he believes that they must focus on one game at a time.
The 26-year-old told The Sun: We need to take three points in all the games. Tottenham is one key game, but we need to keep focused for the future.
"Swansea have a very, very good team — you saw that in the semi-final of the Capital One Cup. We need to be focused for Sunday."
Chelsea have yet to defeat Swansea in three matches this season.