Luiz's future at Stamford Bridge seemed uncertain after he made only nine Premier League starts for the club last season, but he has since established himself as a key member of new manager Maurizio Sarri's starting lineup.
Sarri's mood after the convincing victory was further improved with the news Mateo Kovacic's muscle problem, which forced him off early in the second half, had been deemed not to be serious.
"If he wants to play for another season I think it's right he tries to play". I thought he was one of the best in Europe.
The 31-year-old did not feature from the start in any of Chelsea FC's first five Premier League games this term after having struggled with a knee problem in recent weeks. "We can play, we should play better, but we scored four goals and it's a good game for us".
And that resilience could yet yield an unlikely title challenge after finishing 30 points adrift of Manchester City last season. I think so. When he gets the ball, he can hold it and we can go with him.More news: Apple faces Trump's ire after company says tariffs would hurt products
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The Blues now have five points more than they had at this stage last season as they prepare to start their Europa League campaign.
Chelsea now sit joint top of the table with Jurgen Klopp's Liverpool who ran out 2-1 winners over Spurs at Wembley in today's early kick off. "We need to improve, but we are able to and can improve very quickly". Playing away at one of the Premier Leagues top clubs, Cardiff would have been forgiven for locking up but they very much played the way they wanted to play.
Hazard had the help of a deflection to put Chelsea in front from close range and gave the home side breathing space from the spot after Willian was felled by Bamba.
He hit the bottom corner after dancing round two defenders to shoot low in the 37th minute, then latched on to another Olivier Giroud layoff in the 44th.