Leicester City manager Claudio Ranieri made no excuses for his side after they were dumped out of the FA Cup by Millwall on Saturday.
The Foxes succumbed to a 1-0 defeat thanks to a 90th-minute strike from Shaun Cummings in their fifth-round clash at The Den in London, which also saw Lions centre-back Jake Cooper sent off for two yellow cards.
"They showed more character, more desire, more heart than us," the Italian said. "At the end, they deserved to win.
"They showed a good performance until 10 v 11, but we lost the desire to be concentrated and because they find a goal. No one marked the man."
However, the tactician who guided Leicester to the Premier League title last season can use the loss as inspiration as the Foxes struggle for form ahead of their Champions League clash with Sevilla on Wednesday.
"This defeat could be good for us," he added, "because when you lose against a team who fights, you have to say well done to them but why did we lose?
"I want to speak again with the players and say we have to fight every match. I need the soldiers, I need the gladiators, because Millwall, with 10 players, showed they are fantastic gladiators."