The loss of midfielder N'Golo Kante to Chelsea means Leicester will not repeat their shock title win of last season, says former Foxes striker Gary Lineker.
Led by manager Claudio Ranieri, the East Midlands side claimed their maiden Premier League triumph having started the campaign as 5,000-1 outsiders.
France international Kante joined Antonio Conte's team for a fee of around £30m this summer.
"Kante allowed Ranieri to play the system he did," Lineker told BBC Sport.
"He can't do that anymore. Kante was the most unsung of the big three players, but he was probably the most important.