The Italian sent striker Leonardo Ulloa on for full-back Daniel Amartey in the game against Norwich City on Saturday and was rewarded for his bold decision as the Argentine scored the winner in the 89th minute to keep the East Midlands at the summit.
"I took a lot of risks against Norwich," said Ranieri.
"I said, 'In or out — it's not important now. One point is nothing — we have to win today'.
"You can lose but it's only one point less than a draw. The manager is hired for this reason, to take a risk.
"I expect more games like this, teams coming here with five defenders. There aren't any easy matches. Every match is a battle. Every match you can lose.
"The most important thing is we concentrated and we were focused and we will take that on to the next match now."