The Foxes saw their season hit a new low in the FA Cup as they were beaten by the Lions, despite the League One side having a man sent off
Claudio Ranieri conceded Leicester City were second best once Millwall were reduced to 10 men in Saturday's FA Cup fifth-round shock at The Den.
The Premier League champions were beaten by Shaun Cummings' last-gasp goal as the League One side shrugged off the dismissal of Jake Cooper.
A much-changed Foxes line-up had started brightly, but failed to make their promising first-half display count and looked void of ideas after Cooper's red card in the 52nd minute.