“Home Grown Player” means a Player who, irrespective of his nationality or age, has been registered with any Club (or club) affiliated to the Football Association or the Football Association of Wales for a period, continuous or not, of three Seasons or 36 months prior to his 21st birthday (or the end of the Season during which he turns 21) and for the purposes of this definition of “Home Grown Player” a Season will be deemed to commence on the date on which the first Transfer Window closes and expire on the date of the final League Match of the Season;