Striker Martyn Waghorn is back in the squad for the Cardiff clash – only 10 days after an operation to remove his appendix.
The 22-year-old has missed only one game – last week's defeat at Millwall – and is already back in full training
Leicester City manager Nigel Pearson said Waghorn was "hungry" to reclaim his place in the starting line-up tomorrow against the Bluebirds, especially as he was close to his best form before his illness.
Pearson explained why the decision was taken for immediate operation.
He said: "It was based on the fact he turned up for the game against Barnsley having had a difficult night with sleep.
"He had pains, so we had it investigated and felt it was probably the best thing to do to get it looked at straight away.
"It transpires he was only unavailable for one game so I am pleased we dealt with it quickly.
"He has done really. It is good to have him back in contention and another player who is hungry to be back in the team."
Meanwhile, defender Sean St Ledger has travelled to Munich to see a specialist about his hamstring injury.
The Republic of Ireland international has not played since damaging his hamstring in the victory over Bristol City at the start of October. He was expected to be back playing before now, but his injury has proven to be more complex than first thought.
He has travelled to see the renowned Germany and Bayern Munich doctor, Hans-Wilhelm Muller-Wohlfahrt, in a bid to solve the issue, which may even require surgery.
"He is in Munich now," said Pearson.
"Sean is going to be a while yet but, hopefully, we will get some positive news in the new year."
Pearson said whoever comes out on top when league leaders Cardiff visit the King Power Stadium will have to be on top form to take the three points.
"They have some key players and Malky Mackay (their manager) has got them well organised."