Wes Morgan says the Premier League champions are missing former midfield marshal N'Golo Kante.
Kante sealed a move to Chelsea during the summer after winning the title last season with Claudio Ranieri's Foxes.
Leicester City travel to west London on Saturday to take on Antonio Conte's Blues and they will come up against their ex-team-mate Kante.
However, Morgan says they do miss the France international - who was crowned Leicester's Player of the Season last term.
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"He was fantastic for us last season, he was our Player of the Year, what he did was incredible," Morgan told Sky Sports.
"He came from a relatively unknown team in France and came to England and did extremely well.
"If any team didn't have him, they would miss him and that goes for us. We do miss him, but we have to move on.
"We have got other players that have come in and are doing a great job in that position and there's no point dwelling on the past and dwelling on N'Golo. We have to look forward for ourselves and we have players that can fill his boots."
Leicester will be looking to climb up the league table after sealing eight points from their opening seven Premier League fixtures, five points behind Chelsea.
Morgan added: "Teams know our strengths and will try to nullify them so we have to think of different ways to win and different systems because we don't want to be predictable.
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"Maybe we were overlooked last season, we surprised everyone, this season nobody is taking us for granted. Teams have approached the games with more intensity."