Chelsea left-back Filipe Luis has warned his teammates that they must improve after they drew 1-1 at home to relegation-threatened Burnley.

Manager Jose Mourinho blamed the referee for his side's failure to win, but Luis has told his colleagues that they must sharpen up before Sunday's League Cup final against Tottenham Hotspur.

He told the Telegraph: "We have to say Burnley played a good game and congratulate them. I don't believe in luck and I don't want to talk about the referee. We had chances to win the game, we played a lot better than them and created a lot of chances. We have to improve and play better in every game.

"We created chances, everybody was running in attack. We have to know that every game is not easy, and to be top of the league every game is more difficult because everybody is trying to steal points from us. Now we have to work hard and train more, improve every day."

Chelsea are now just five points clear at the top of the Premier League table.