Chelsea manager Mauricio Pochettino has confirmed Christopher Nkunku is not seriously injured.
The attacker has not been seen for the past few weeks with a seemingly minor hip injury.
As the Blues prepare to take on Middlesbrough in the Carabao Cup semi final second leg on Tuesday, they will be without the French forward.
This week, Pochettino told reporters: "No, [Nkunku] is not available for tomorrow.
"It is a shame but he is still recovering from some suffering in his hip and we hope he can be back as soon as possible with the team - it's not a big issue."
He added: "Malo Gusto is out tomorrow. He suffered an injury against Fulham and is not available for tomorrow."