The Reds dominated the first period in the midlands but were unable to find a way through and substitute Okazaki fired in a 67th-minute opener before Slimani lashed home a second 12 minutes from time to send the Foxes through.
Jurgen Klopp’s side, who have now gone four games without a win, were not the only Premier League team to exit inside 90 minutes as Stoke and Huddersfield both fell to away losses at Bristol City and Crystal Palace respectively.
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The Potters were undone by two goals in 10 second-half minutes from Famara Diedhiou and Matt Taylor, while Roy Hodgson earned his first win as Palace boss thanks to Bakary...