The Foxes, who beat Crystal Palace 1-0 on Saturday, are five points ahead of Tottenham Hotspur at the summit with seven matches left.
"We don't speak about the title. We are speaking about our performance, how we play the last match and how we must play today," said Ranieri, whose modestly funded club narrowly avoided relegation last season.
"That is our focus. When I say my players are very concentrated before the match, during the match, I am very calm.
"Okay, we can win, we can lose, but our performance is good. And then when our performance is good, you can't tell them anything because if they make a mistake, it is normal."