Luka Modric has warned his Tottenham team-mates overconfidence could prove fatal in Sunday's London derby against misfiring Chelsea.
In-form Spurs have been tipped to pile on the misery for Carlo Ancelotti's Premier League champions, who have won just two of their last eight games in all competitions.
That has seen them surrender top spot in the league, while defeat on Sunday would move fifth-placed Tottenham to within a point of their city rivals.
