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Edouard Mendy played only the first 45 minutes of the Premier League clash against Aston Villa.
Mendy collided with the post in the last minute of the game as he tried to keep off a Bertrand Traore strike.
Chelsea boss Thomas Tuchel has admitted his worry that the Senegal international may miss the Champions League final against Manchester City on May 29.
“He fell on the frame [post] from the goal net when he landed and hurt his ribs,” Tuchel said after Chelsea’s loss to Aston Villa.
“We are worried. We don’t know if it’s an impact injury or it’s more serious. We have to wait for the scans later.”
Tuchel added: “He has big pain in his ribs.
“We need to wait until we get home and we will do some images.
“Tomorrow we will have an update on what’s going on.
“We have a week to prepare, and we will see if it’s possible. If it’s possible we need to push and do everything so he is in goal on Saturday.”