By Jamie Spencer Jurgen Klopp has warned Liverpool need to ‘play better football’ if they are to finish this season as Premier League champions, but still need a ‘crisis’ at both Manchester City and Arsenal too. Having led the league from December until early April, Liverpool have stumbled at the wrong time, taking only four points from the last 12 available to them – including damaging defeats at the hands of both Crystal Palace and Everton. Within the last five weeks they have also been knocked out of both the FA Cup and Europa League, leaving once optimistic hopes of a potential quadruple f…