What do Liverpool need to do to climb out of their slump?

Liverpool manager Jurgen Klopp still has many questions to answer (Laurence Griffiths/PA)

Things are not getting any better for Liverpool as a first defeat in an Anfield Merseyside derby since 1999 at the weekend only added to the sense their season is coming off the rails.

A fourth successive loss means they are on their worst Premier League run since 2002, a quartet of home league defeats is their worst run in more than a century and yet another injury ruling out a fifth centre-back option have left the defending champions stuck in something of a rut.