data scientist sports analytics football scout assignments chief executive officer club technical director sports director of football role caretaker manager football interim coach duties new manager appointment managerial sacking rumors pre match press conference open training session mixed zone player statements post match press interview halftime team talk dressing room speeches vice captain leadership captaincy duties football pre match routine football mental toughness athlete sports psychologist elite physiotherapist matchday sports massage therapist hydration strategy athlete carb loading match day protein intake footballers