Endo had come off the bench in Liverpool's recent 2-1 loss to Chelsea, which was only his sixth appearance of the season. His reduced playing time under manager Arne Slot may have contributed to the injury.
The extent of Endo's injury is not yet clear, but it has prevented him from joining the Japan squad for their upcoming matches against Paraguay and Brazil. This means that Liverpool's midfield options are now more limited, particularly heading into their upcoming match against Manchester United.
Endo is not a first-choice midfielder for Liverpool, but his absence adds to the club's injury concerns. Manager Arne Slot will need to find alternative solutions to fill the gap in his squad.