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Chelsea boss Thomas Tuchel will be without key Chelsea goalkeeper Edouard Mendy for one month next season.
This is because Senegal will be participating in the Africa Cup of Nations which will take place in early 2022.
The competition, which was last won by Algeria, was due to be staged at the beginning of the year, however, it was forced to be pushed back a year due to the coronavirus crisis.
Chelsea will also be without Hakim Ziyech after Morocco secured their spot at AFCON 2022.