Jurgen Klopp refused to speculate on the reasons why Tottenham have failed to replicate their form of last season, but predicted a difficult test for his Liverpool side on Sunday.
The Merseysiders overcame Mauricio Pochettino's men in the Champions League final in June, with Spurs expected to challenge towards the top of the Premier League table again this term.
But Spurs have won just three of nine league games to sit 13 points behind leaders Liverpool and five adrift of fourth-placed Chelsea.
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There have been reports of dressing room discontent but Klopp was unwilling to offer an outsider's view when asked to assess Tottenham ahead of the weekend clash at Anfield.