The Senegalese international joined Chelsea from Rennes at the end of September and will be hopeful of starting against his former club when we meet at Stamford Bridge in the Champions League on Wednesday evening, having played a big part in the French club qualifying for the competition for the first time in their history last season.
Mendy has enjoyed an excellent start to life in west London, conceding just once in his six appearances for the Blues so far. But how closely have you been paying attention to our new goalkeeper during those matches and how much do you know about his career before Chelsea? You can find out in our quiz on the 28-year-old below. Good luck!
