The Foxes have made a triumphant return to the top flight so far this season, amassing eight points from a tricky opening set of fixtures that has seen them beat Manchester United and Stoke City, draw with Everton and Arsenal and lose to Chelsea.
Nigel Pearson's side came from 3-1 down in the final half-hour to beat United 5-3 last time out, but Warnock believes that he can learn more from analysing their 1-0 victory away to Stoke a week before.
"The Man United game is a very unusual game, so I don't think you can take too much out of that game, other than that they took their chances really well," Warnock told reporters.
"I look at the way they beat Stoke. That's more realistic, I think. They beat Stoke quite well, they were very organised. It's a hard place to go Stoke and it was a fabulous result. They were very professional."
Palace are also coming into the match on the back of an impressive league victory having beaten Everton 3-2 last weekend.