Jurgen Klopp has warned that there are "only great teams left in Europa League" ahead of Liverpool's clash against Atalanta.Their quarter-final opponents sit sixth in the Serie A table and put out Sporting Lisbon in the previous round - but have won only two of their last nine matches.Pep Guardiola described playing the Bergamo-based side as like going to the dentist in 2019, and long-serving manager Gian Piero Gasperini remains in charge.“There are now only great teams left in the competition,” Klopp said ahead of kick-off. “It’s really outstanding and we know what Atalanta are all about."