Midfielder Philippe Coutinho will miss the second leg of Liverpool's Champions League play-off against Hoffenheim on Wednesday with illness.
Liverpool last week rejected a third bid from Barcelona for the Brazil international, who has not played this season because of a back injury.
Manager Jurgen Klopp said Liverpool's stance had not changed, and that he had "no idea" when Coutinho will return.
Liverpool take a 2-1 lead into the match at Anfield.
The winners will progress to the Champions’ League group stage.
"The main difference between last week and this is everyone knows the quality of Hoffenheim," Klopp said.
Hoffenheim have never reached the Champions’ League group stage, while no German side have won a European tie at Anfield.
Hoffenheim manager Julian Nagelsmann said his side would "not be intimidated" by playing at Anfield.
Hoffenheim beat Werder Bremen 1-0 in their opening Bundesliga game on Saturday.