Liverpool coach Jurgen Klopp has said he is "12 out of 10" frustrated and at a loss to explain his side's poor display in Saturday's 2-2 draw against Fulham.
Last season's Premier League runners-up needed a debut goal from substitute Darwin Nunez and Mohamed Salah's 80th-minute strike to twice come from behind and cancel out Aleksandar Mitrovic's brace at Craven Cottage.
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Although Liverpool salvaged a draw and had chances to win the game, they were some way below the impressive form which proved enough to beat champions Manchester City 3-1 in the Community Shield.