Chelsea boss Maurizio Sarri says Mateo Kovacic's injury isn't serious after victory over Cardiff City.
Kovacic was forced off in the second-half.
But Sarri revealed the injury was 'nothing serious' and praised his team
He said, "I'm very happy because I thought the beginning for me would be very difficult. I'm lucky because I have a good team, good players, not only one. I'm very happy with my team, I'm happy to be here in the Premier League."