Millwall progressed to the sixth round of the Emirates FA Cup at Leicester's expense after Shaun Cummings scored in the 90th minute at the Den to pile yet more misery upon Ranieri and the defending Premier League champions.
"I want to speak again with the players and say we have to fight every match," said an animated Ranieri. "'Who wants to fight? Tell me'. I need the soldiers, I need the gladiators, because Millwall, with 10 players, showed they are fantastic gladiators.
"It is strange because last season we won for this, to be more determined than the opponent and play with more heart than the opponent. We could also lose but we would fight every match. I want to see this, the fight until the end.
"This defeat could be good for us because when you lose against a team who fights, you have to say well done to them but why did we lose?"