Chelsea striker Diego Costa: I know goals will return for me

Costa is ready to play his part in helping the club back up the table.

He said: "I think I played well on Wednesday.

"As my confidence grows the goals will return. It was more than just not scoring, it was that I wasn't playing well, either. That was hurting me a lot.

"Me and the manager knew I had to get a lot better. I think I put in a better performance against Porto. I wasn't one of the best in the team but I felt I did my individual jobs well."