The Foxes sent Kop boss Jurgen Klopp home ‘sick’ following their 2-0 Carabao Cup defeat.
Liverpool return to the King Power stadium on Saturday with a chance to put the record straight in a league clash.
Serbian midfielder Grujic says if the Reds can repeat their first half dominance second time around they will take home three points.
Klopp’s men failed to capitalise on their domination and were then hit by goals from Shinji Okazaki and Islam Slimani as Leicester claimed a last 16 spot.
Grujic said: "We played very well first half, created a lot of chances, but we didn't score.”
The 21-year old, a £5m signing from Red Star Belgrade, was making his first start of the season in a much-changed line-up.
He added: "We have to not let our heads drop and focus on Saturday - the same pitch, the same opponent - we have to concentrate on the Premier League and the other cups.
"If we play again the same way as in the first half and be more concentrated and score some chances, we will win on Saturday.
"It's a good thing for us, we create a lot. But we need to concentrate and score."
