The Blues will play Southampton in the semi-final after Pedro's extra-time winner sunk the Foxes.
"It's good for our confidence and to help us fight in the next games," said Pedro.
"We are in a difficult situation in the league but in the FA Cup we are in the semi-final against Southampton. It's an opportunity for us to go to the final and help us fight until the end for the top four.
"But now is the moment to enjoy this win because it's difficult to win against Leicester."