The All Blacks coaching staff admit they're uncertain as to whether or not captain Richie McCaw can cope with three more World Cup matches due to his foot injury.
McCaw's twice been named to start Tests in pool play, but then been withdrawn late in the week although Henry says he will play in Sunday's quarterfinal against Argentina in Auckland.
Henry says McCaw's had to change his training schedule, spending more time off his feet and in the gym in the lead-up to games.
Henry concedes he doesn't know if the stress-fracture related injury is getting worse.
