Jurgen Klopp admits Liverpool face a tough task advancing to the Champions League last-16.
The Reds must draw or beat RB Salzburg in Austria to quality after they could only manage a 1-1 draw with Napoli on Tuesday.
"In [the Napoli] dressing room they feel like they are already through and maybe they are," Klopp told BT Sport.
"Everybody here thinks, 'Oh my God, it will be tough' and it will be tough, that much is clear."
He added: "In this moment, the game is over, so my problem is Fabinho is injured and Brighton [is next] - not Salzburg, not at all.
"But I know how human beings are; people wished we could finish the group tonight and make kind of a holiday game in Salzburg. Never happened, will never happen.
"So, that's the situation. If we have ambitions in the Champions League, we have to show that in Salzburg - and until then, we have to show our ambitions in the Premier League. There are a couple of games to play until then and we have to be focused on them - and we will be, no doubt."
