Leicester City boss Brendan Rodgers admits the lack of hunger among his players is a concern.
The Foxes were battered by Championship side Nottingham Forest in the FA Cup fourth round.
Leicester, who won the competition last season, were humbled 4-1 away from home on Sunday.
Rodgers’ side have only five wins from their past 18 games in all competitions.
He said: “We made mistakes and the mistakes then affect the confidence through the team. You go two quick goals behind and you’re chasing the game then.
“For me, it’s something that I’ve seen for a little period now. These players, some of them have done very well, but we lacked that hunger and physicality, which was never the case and is something that’s a concern.
“We lacked stability at the back, gave away poor goals and the two quick goals rocked us. In a game of this importance – particularly a derby game, away from home – you need to have authority and you need to have physicality, and we lacked that in abundance.
“They deserved to win – scored the goals, showed a greater desire and that’s the disappointment.”
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