City have also won 17 of their 18 league matches this season, but Puel believes the Foxes have a chance of reaching the last four and he reckons their fans could make the difference.
He said: "We play a fantastic team, for me the top team in Europe. You know the difficulty to beat this team. All the teams try but without the good result at the end.
"I think it's a good opportunity, a strong challenge for us to try to beat them. It's a special and unique game because it's a quarter-final.
"I think with the support of our fans we can make a fortress of the King Power Stadium."