Jurgen Klopp confirmed Roberto Firmino was injured in training for Liverpool "two days ago" as he missed the Carabao Cup clash against Manchester City.
The Liverpool manager admitted Fabinho, Jordan Henderson and Alisson Becker all could have played in the cup tie with City, but it was decided more rest would be given to the World Cup trio.
Virgil van Dijk has now returned to training after Netherlands were knocked out of the World Cup by Argentina in a quarter-final penalty shootout.