Nigeria’s Victor Osimhen denied Leicester the perfect start in the Europa League as Napoli hit back from 2-0 down to snatch a point.
The striker struck twice in the second half as the visitors deservedly grabbed a 2-2 draw in Group C at the King Power Stadium.
Ayoze Perez’s first goal since March and Harvey Barnes’ second-half goal gave the Foxes a commanding lead.
But Osimhen grabbed a classy lifeline for the visitors and then headed in a late leveller, with Leicester’s frustrations compounded when Wilfred Ndidi was sent off in injury time.
Policemen and stewards had to control a disturbance between the home and travelling fans at full time with missiles thrown between supporters.
Napoli controlled much of the game and were almost left to rue several missed chances with Osimhen, Hirving Lozano, Piotr Zielinski and Kevin Malcuit all wasteful in the first half.
The Foxes – who only introduced Jamie Vardy as a late substitute – go to Legia Warsaw, who won at Spartak Moscow on Wednesday, in two weeks.
In another encounter also played on Thursday, Steven Gerrard’s 50th European tie as Rangers boss ended in a 2-0 Europa League defeat by Lyon at Ibrox.
Cameroon international Karl Toko Ekambi fired in a terrific opener for the French side after 22 minutes of the Group A opener in Govan.
The Scottish champions had come close on a few occasions in the first half but in the 55th minute Gers skipper James Tavernier put through his own goal trying to stop a close-range shot from Islam Slimani.
Despite a huge effort from the home side, it was too big a lead to claw back.
Meanwhile, West Ham United began their Europa League campaign with a 2-0 win at Dinamo Zagreb in Group H action.
Michail Antonio gave West Ham a 22nd-minute lead in the Croatian capital.
This was when he rounded goalkeeper Dominik Livakovic and rolled the ball into an empty net after intercepting a poor back pass by Kevin Theophile-Catherine.
Declan Rice sealed the win with a fine individual effort in the 50th minute.
This was after he raced clear of his marker down the left from the halfway line and drilled the ball home through Livakovic’s legs from eight metres.
Meanwhile, a stoppage-time goal from Paul Onuachu gave Belgians Genk a 1-0 win at Rapid Vienna in the other Group H match.
