Chelsea boss Mauricio Pochettino admits they've been hit by another injury setback.
Mykhaylo Mudryk is out of Chelsea's clash with Luton on Friday night.
Pochettino lamented: "He will be not play tomorrow. It is disappointing; he is a player we have hopes for, to help him perform the way we believe he can.
"It is not a big issue, maybe a week or a few days to have him involved in the team."
The Argentine also commented on Carney Chukwuemeka, who has undergone knee surgery: "It is unlucky, especially to lose Carney [Chukwuemeka] on Sunday. That is football. I am positive we will compete tomorrow.
"Carney's issue is not as big [as feared]. I think weeks, rather than months. Hopefully he can be back as soon as possible. He scored and then got injured; it is unlucky but can be stronger. He is young and he will be much, much better."