Goalkeeper Edouard Mendy has returned to Chelsea after injuring his thigh while training with Senegal.
Mendy, 28, joined the Blues on a five-year deal last month and kept a clean sheet on his Premier League debut against Crystal Palace.
He injured his right thigh in training on Wednesday and has been sent back to London after an examination at a hospital in Rabat.
Senegal play Morocco in a friendly on Friday night.