Bissouma has a UK residence permit, which I assume is connected to a work permit.
https://www.tribalfootball.com/articles/brighton-midfielder-yves-bissouma-to-miss-mali-clash-4256547#popup-sso
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He definitely needed to get a work permit as he went to Paris after his medical in order to leave and re-enter the country as part of the process.
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