I don't think they can do it but the game is still open.
It was a disappointing score at the end truthfully after seeing the way Liverpool started the match. An early goal to get ahead by nothing more than that later on... Klopp was smiling in the last moments of the match because of a frustration probably. He was really desperate after not being able to score any more goals in the same half.
His substitutions as of the 66th minute also showed that he gave up and he just wanted to save some of his important players' energies for the Premier League match ahead.
Some people will criticize him for that some won't because of the PL's being more important.