I forgot to say : The manager as in 'Sir Alex Freguson is the manager of Manchester United' is l'entraineur' [circumflex accent on the i ]. French football clubs often have a president whose position may be honorary (but sometimes influential) and he is called president but they'll have someone who is responsible for running the business day to day. That person is termed ' le directeur general [ acute accent on each 'e' in 'general ']'
You'll be pleased to know that English terms are quite the thing in French business, and some are old-established.' Le staff' are the personnel and so it's 'le staff' of a football club and, no doubt, they suffer from what, in French, is called 'le stress'. Major French companies expect their staff to know English, they issue reports in English and often conduct meetings in English. Nice Matin newspaper reported a case of a French multinational that conducted a top-level meeting in English only to find later that everyone present was French !