The Italian was led onto the pitch by Foxes boss Claudio Ranieri before their final home game of the season against Everton with Leicester having won the title.
Halfway through Nessun Dorma tenor Bocelli revealed he was wearing a Leicester shirt to spark huge cheers from the home fans.
Bocelli, who called Ranieri two months ago to offer his support in the title race with the Foxes manager helping to organise the performance, finished with Time to Say Goodbye.
Ranieri said, addressing the crowd, “We are the champions because you pushed this club so much. Thank you so much.”
Wow. Thank you to Andrea Bocelli for one of the most unforgettable moments we'll ever see at King Power Stadium. Incredible. #havingaparty
— Leicester City (@LCFC) May 7, 2016
Thank you #Leicester and congratulations #LeiEve @LCFC pic.twitter.com/JCdw8S8IvW
— Andrea Bocelli (@AndreaBocelli) May 7, 2016
Wonderful hospitality was so fantastic to meet everyone #Leicester #LeiEve @LCFC pic.twitter.com/YUFR8Ay0XR
— Andrea Bocelli (@AndreaBocelli) May 7, 2016