Liverpool's hopes of securing a place in the last-16 of the Champions League remain in the balance after they surrendered a three-goal lead in against Sevilla on Tuesday.
Jurgen Klopp's side raced into a 3-0 lead in Spain thanks to goals from Roberto Firmino and Sadio Mane. But a second-half implosion means they still need to beat Spartak Moscow in their final group game to be assured of top spot in Group E.
Here Sportsmail answers some of the key questions surrounding Liverpool's defensive issues and ponders what can be done to solve them.