Premier League champions Leicester City can use the FA Cup win over Derby to kick-start their season, says midfielder Andy King.
The Foxes are one point above the relegation zone after winning two of their past 15 league matches.
But a much-changed side raised morale with a 3-1 win, clinched by two extra-time goals, in the fourth-round replay against their East Midlands rivals.
"We showed the fight we have got in the squad," Wales midfielder King said.
Manager Claudio Ranieri led the club to the Premier League title last season despite the Foxes being 5,000-1 shots, but recent reports suggested he had lost the support of his players.