Saracens are set to have 14 players from their title-winning squad in Japan, while Harlequins, Leicester and Northampton feature heavily.
Fifteen of Mark McCall’s 2018/19 Gallagher Premiership champions will be going for more glory in Japan.
Leicester Tigers (8 players), Harlequins (9) and Northampton Saints (8) are some way off Sarries impressive total.
*Figures are based on current squads and will be updated when official squads are announced
Rugby World Cup Premiership players club by club
BATH RUGBY – 6
Sam Underhill (England), Jonathan Joseph (England), Joe Cokanasiga (England), Ruaridh McConnochie (England), Anthony Watson (England), Francois Louw (South Africa)
BRISTOL BEARS – 5
James Lay (Samoa), Jordan Lay (Samoa), Chris Vui (Samoa), Alapati Leiua (Samoa), Siale Piutau (Tonga).
EXETER CHIEFS – 7
Luke Cowan-Dickie (England), Henry Slade (England), Jack Nowell (England), Sam Skinner (Scotland), Tomas Francis (Wales), Elvis Taione (Tonga), Onehunga Havili (Tonga)