Frank Lampard criticised the attitude of some of his Chelsea players after admitting the Blues were easily beaten by the "better side" in a 2-0 defeat to Leicester City on Tuesday.
Victory took the Foxes top of the Premier League, nine points clear of Chelsea, who slip to eighth.
A fifth defeat in eight league games piles more pressure on Lampard's position as a £220 million ($300 million) spending spree in the transfer market has failed to reap instant reward.
"We were beaten by the better team," said Lampard.
"I thought they were sharper than us, ran more than us, showed moments of quality. They looked like a team in form and we looked like a team out of form."
First-half goals from Wilfried Ndidi and James Maddison put Leicester in a commanding position and Brendan Rodgers's men could have inflicted a more embarrassing scoreline on Lampard had they taken their chances after the break.
