Leicester moved top of the Premier League by inflicting another damaging 2-0 defeat on Chelsea on Tuesday, to leave manager Frank Lampard fighting to remain in charge at Stamford Bridge.
The Blues have now won just two of their last eight league games to fall to eighth, nine points behind the leaders.
Chelsea were expected to challenge for the title after a £220 million ($300 million) spending spree in the transfer market.
But it is Leicester who are threatening to recreate their heroics of the 2015/16 season when they shocked the football world to win the Premier League as first-half goals from Wilfried Ndidi and James Maddison earned a thoroughly deserved win.
“It sounds nice ‘top of the Premier League’,” said Maddison. “It’s a good one psychologically because we’ve worked really hard. It’s a great achievement halfway through the season.”
Both Manchester City and Manchester United have the chance to usurp the Foxes when they are in action on Wednesday.