Chelsea goalkeeper Edouard Mendy has suffered a thigh injury while on international duty with Senegal.
Mendy picked up the injury during Senegal's training session and has returned to London for assessment by Chelsea's medical team.
Blues manager Frank Lampard will hope Mendy can recover in time to face Southampton at Stamford Bridge in his team's next Premier League game on October 17.
Chelsea also face Sevilla in their opening Champions League game and Manchester United in the Premier League following the international break.
Mendy joined Chelsea from Rennes in a £22 million ($28 million) deal last month.
The 28-year-old kept his first clean-sheet for the club in his first Premier League start against Crystal Palace last Saturday.
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Chelsea v Palace ratings
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CHELSEA RATINGS: Edouard Mendy – 7: Sharp reflexes to save a deflected shot in the second half but apart from that, was rarely called into action. Clean sheet on his Premier League debut. Reuters -
Cesar Azpilicueta – 7: Chelsea’s captain was as dependable as ever, supporting Hudson-Odoi down the right and keeping Palace’s counter-attacks at bay. PA -
Thiago Silva – 8: Forget the mistake against West Brom, the veteran Brazilian is already showing what he adds to Chelsea’s backline: an assured presence, leadership, and top-class positioning. Never looked troubled against Palace. Getty Images -
Kurt Zouma – 9: After glancing a great chance wide, the Frenchman made no mistake of his second attempt, guiding home Chilwell’s cross for Chelsea’s second. Even without the goal, Zouma put in a top performance. Strong in the tackle, dominant in the air, and sharp anticipation throughout. AFP -
Ben Chilwell – 9: One game into his Premier League career with Chelsea and already a clear upgrade on Marcos Alonso. Always an option on the left, excellent distribution and took his goal extremely well. Then provided a wonderful cross for Zouma’s goal. Dream debut. Getty Images -
N’Golo Kante – 7: Operating in a midfield two with Jorginho, Kante was able to play to his strengths by breaking up play, protecting the defence and distributing forward passes. PA -
Jorginho – 8: Trademark Jorginho performance. Helped Chelsea control possession, spread the play, gave away a few niggly fouls, then hopped, skipped and jumped his way to two penalties. Good game from the Italian. Reuters -
Callum Hudson-Odoi – 7: Looked to be really enjoying himself, particularly in the second half. Was the more effective of Chelsea’s two wingers and provided cutting edge and service from the right. Surely he’s not going out on loan? PA -
Kai Havertz – 7: The German just oozes class; the weight of his passing is flawless, and he glides across the pitch linking play and creating space. Lovely little dink over Sakho to earn Chelsea’s second penalty. Encouragingly for Chelsea, there is so much more to come from him. Getty Images -
Timo Werner – 6: Deployed on the left wing, Werner was stifled in the first half and played a secondary role once Chelsea ran riot. Looks far more dangerous when played through the middle. Reuters -
Tammy Abraham – 7: Led the line well, linked up play, and his movement pulled Palace defenders out of position. No goals but played his part in a dominant win. Wanted to take second Chelsea penalty but was overruled by captain Azpilicueta. PA -
SUBS: Mateo Kovacic (83’) – N/A. AP -
Christian Pulisic (83’) – N/A. AP -
CRYSTAL PALACE RATINGS: Vicente Guaita – 6. Couldn’t do much about any of the goals and was sharp off his line when he needed to be. Reuters -
Joel Ward – 7. The fact that most of Chelsea’s best attacks came down the opposite flank is testament to Ward’s performance. Kept Werner quiet much of the game. AFP -
Cheikhou Kouyate – 7. Rock solid during a first half that saw Palace comfortably manage Chelsea’s attacks. Was not at fault for any of the goals. Reuters -
Mamadou Sakho – 5. The Frenchman was emblematic of Palace’s implosion and gave away a sloppy penalty when he clipped Havertz. Reuters -
Tyrick Mitchell – 5. Stood up well to Hudson-Odoi in the first half but the Chelsea winger won their duel in the second. Gave away a clear penalty on Abraham. AP -
Andros Townsend – 6. Put in one sumptuous cross in the first half and looked like he could threaten on the break. Ultimately, though, he didn’t. PA -
James McCarthy – 6. Sorry folks, no photos of McCarthy, which might be a reflection of how little of the ball he saw in this game. That said, he helped Palace keep their shape in the first half. Replaced midway through second half. AP -
James McArthur – 6. Like his similarly named midfield partner, it was a tough outing with Palace rarely enjoying any spells of possession. PA -
Eberechi Eze – 7. There were certainly glimpses during the game that hinted at why Eze is so highly rated as he tried to get on the ball and make things happen. AP -
Wilfried Zaha – 6. Could barely stay on his feet in the first half – no, not from incessant diving but the slick surface. More involved in the second half but never really threatened. AFP -
Jordan Ayew – 5. Can’t recall anything of note from the Ghanaian, whose biggest contribution was getting fouled in the lead-up to a Chelsea goal. Reuters -
SUBS: Luka Milivojevic (67’) – 6. Introduced with Palace 2-0 down, the Serbian did not influence the game. Getty Images -
Jairo Riedewald (72’) – 6. The same as Milivojevic. Reuters
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"The Senegalese Football Federation has announced the withdrawal from their squad of Edouard Mendy due to injury," a Chelsea statement said on Friday.
"The goalkeeper sustained an injury to his right thigh during training on Wednesday and had a medical examination in a hospital in Rabat, where Senegal are due to play Morocco tonight.
"Mendy has since returned to Chelsea where he will undergo further examinations."
Mendy was signed to replace Spaniard Kepa Arrizabalaga, who this week expressed confidence he can win back the Chelsea keeper's jersey.
Kepa, the world's most expensive keeper, kept a clean-sheet for Spain against Portugal on Wednesday. If Mendy is sidelined by his thigh problem, Lampard will have to turn to Kepa or Willy Caballero.
